How To Install Two Hot Water Heaters Together

Cold h2o feeds into 1 heater: option #1 series
Hot water from water heater #1 feeds into #two
Both water heaters supply whole firm
Purpose: Twice as much hot water available.

How to control toll:
one) Plough off heater #one and save $xl per calendar month
2) Use heater #ane as tempering tank to passively raise temperature to ambient room temperature
three) Install timer on heater #1 or both heaters
4) More than ideas: Insulate pipes, Insulate water heaters, Turn down thermostats and save, turn up thermostats and install mixing valve to increase amount of hot water.
Purchase:
Water heater installation kit
Shark bite water heater connection
Resources:
Tempering tank
Compare timers
9 ways to save
Add together another thermostat to h2o heater
Advantages mixing valve
How to increase amount of hot h2o

Cold water feeds into ane heater:  option #two series
2 separate hot water lines for different parts of business firm.
Purpose: Twice every bit much hot water available.
Turn up water heater thermostats and add mixing valve to moderate temperature on piping going to bathroom and allow hotter water on pipage going to washing machine.
The first heater does most of the work and wears out sooner

How to control cost:
1) Plough off heater #1 and save $40 per month
two) Use heater #ane every bit tempering tank to passively enhance temperature to ambient room temperature
3) Install timer on heater #i or both heaters

Resources:
Mixing valve
Temperature needed to kill bacteria
Tempering tank
Compare timers

Cold water feeds into 2 heaters: Option #one
2 separate hot water lines for different parts of house.
Increase heating capacity without ownership large, expensive heater
Advantage from series: one heater can be controlled by a timer, or dwelling automation.
The commencement heater does most of the work. Mitigate problem past using the second heater for less-used function of abode.

Plumber's annotation nigh terminology:
This is not considered parallel piping according to plumbers. This is just ii h2o heaters sitting adjacent to each other, merely is labeled 'parallel' on this webpage for organizational purposes. Parallel option #1 shown in a higher place is an actual parallel system, and requires the piping on hot and common cold to be equal for the heaters to draw down equal. Two water heaters sitting next to each other, shown on left, does not require specific lengths of pipe to work correctly.

If tanks are different size or types ... and are non identical to each other, and then connecting in serial, or cold into both heaters (as shown in a higher place) are best choices.
This means a fifty gallon gas and 30 gallon electric, or ii dissimilar size gas, or 2 different size electric can be plumbed together without problem. 2 different tanks plumbed in parallel (shown below) would be a problem.

Which size tank should come offset? At that place are no rules except what works. For case if home uses 65 gallon of hot, and so install the 50 gallon heater nearest to faucets, and 30 gallon farthest from faucets. This might maximize usage out of the xxx gallon, causing less cold h2o to enter big tank so that large tank re-heats using less energy.  Water heater formulas and terminology

Which tank should have college temperature? There are no hard rules for right temperature when tanks are in series. Each tank tin have different temperature. If tanks are in parallel (shown below), the temperatures should exist the aforementioned.
How-to-adjust-h2o-heater-temperature

There are 3 ways to await at temperatures.

1) Set both heaters to same temperature and run into if it supplies enough hot water. The higher the thermostat setting, the more heat energy is stored within the tank, then y'all get more hot water per tank when thermostats are set higher. Ways to increment hot water
two) If you need very hot water correct away so closer tank should be set up higher and the further tank can be prepare lower.
3) Temps over 135� pose risk of scalding ... then prepare shut tank to safe 125-130�, and farthest tank to 150-160� will supply more hot h2o with low take chances of scalding.

All settings are guess, with factory accuracy +-5% more or less. H2o heater thermostats come up out of calibration, requiring replacement.
Open up TP valve or drain valve and check actual water temperature using cooking thermometer. If drain continues to drip afterwards, install a brass hose cap.
Buy: Kitchen thermometerTemperature gauges
Buy:
Purchase replacement brass drain valve
Contumely hose caps

Parallel heaters must be same size, and close to identical, and thermostats set to same temperature for parallel to work. Ii heaters must be aforementioned size for parallel

Parallel is not best selection if you take two unlike size heaters. Why? Because the small heater will run out of hot before the big heater, and and so small heater volition start adding cold water into the hot h2o line.

Ii heaters must be same blazon for parallel

Parallel is not best option if yous have two different types of heaters, for case a gas and electric heater, or gas and indirect heater, even if both are aforementioned size. Why? Considering the gas will outperform the electric, or indirect outperform the gas etc and and then one heater tin start putting cold water into the line.

With parallel, the temperature setting should be close to identical on both heaters. Be mindful that thermostat settings are approximate and each thermostat will have a different scale ... or in some cases a wide difference in calibration, for case with gas heaters, the range of temperature drop before tank fires up once more can be 10+� different from each other. This could be a trouble, simply not ordinarily.

On electrical heaters, information technology'southward cheap and easy to swap thermostats to solve a scale issue, just gas valve thermostats are expensive replacement. Exercise not expect manufacturer to grant a new gas valve nether warranty.

Common cold water feeds into two heaters:  option #ii parallel
Both water heaters supply whole house.
Parallel is different than other options.
Parallel is defined as: ''Equally manifolding the inlet water pipage and outlet water pipe in multiple heater installations. Having equal number of fittings; as well as lengths of pipe.'' Both heaters are used every bit.

Increase hot water capacity without buying large, high tech heater or paying premium for a large less efficient commercial form heater.
Review Polaris condensing heater  Problem with Vertex condensing heater
Review Marathon electric heater   Commercial 100 gallon gas heater pdf

Disadvantage: Parallel uses both heaters every bit, so you cannot turn off ability to one heater to relieve energy unless you install shut offs on hot h2o line isolating 1 of the two heaters.

Caution: 'Balancing in parallel is catchy and frequently one heater does all the work and the other simply sits there.' If the heaters are not piped properly, information technology will NOT double the capacity and the organisation volition not be efficient. One heater volition supply more than the other heater.''
Incoming cold h2o line should be equal length to each heater, with matching pipe diameter, and status then aforementioned amount of cold is supplied to each heater without constriction..
''The pipe on the hot must be equal for the heaters to draw downwardly equal. Ideally you desire l% from each heater, otherwise one heater will run out of hot before the other heater, and brainstorm to add cold h2o to the line.''
Pipe bore, elbows and altitude must be identical, for the Hot to be fatigued as. Obstructions in the pipe tin can impact outcome, and then fresh plumbing should be installed on both heaters.

Notation: Both water heaters must exist ON, and gear up to aforementioned temperature. If ane heater is off, then it will add cold water to the line while other water heater supplies hot. This means a malfunction in one heater will bear on hot h2o supply ... and a timer cannot be added to one heater but non the other. Plumb heaters with valves and so they can be isolated from each other.

Buy:
Ball valve
Brass gate valve
40 gallon electric h2o heater
40 gallon gas water heater

Parallel / pipe must be equal on Hot and Cold pipes
Piping on the hot and common cold must be equal for the heaters to draw down equal. Ideally you desire 50% from each heater, otherwise one heater volition run out of hot before the other heater, and begin to add cold h2o to the line.

If h2o heaters are different size (different heights), then measure pipes and install so both pipes are aforementioned length to the indicate where they meet.
Piping diameter, elbows and altitude must be identical, for the Hot to exist drawn equally. Obstructions in the pipage can bear upon outcome, then fresh plumbing should be installed on both heaters.

How to Residue two parallel water heaters
The sources I've read, indicate that precise balancing is hard to exercise ...
One strategy might exist to set the thermostat unlike on each water heater.
Fix container under TP overflow tube, open TP valve on each heater and get baseline temperature using cooking thermometer, then average ii temps.
Run Hot tap at bathtub and measure temperature... if the bath temp equals the average temp, the heaters are balanced.
How you lot would correct the difference, and possibly balance heater, is to keep adjusting thermostats until average is reached. Which is the all-time design, Series or Parallel?
Beginning off, Parallel is a challenge getting each water heater to remainder into equal draw. It might exist impossible unless heaters are identical BTU rating and gallonage, and at that place is no guarantee that the pair will stay balanced over time.

Does this mean Series is meliorate?
In my opinion yes, considering heater #1 can be turned off except during peak usage times. This gives Series a clearcut advantage if higher usage is just occasional, such as weekends or filling a large bathtub occasionally.

Sales manager from Lochinvar pointed out a disadvantage for Series that should be noted.
He says 'if both tanks are used continually, so tank #1 is doing most the piece of work, and will habiliment out sooner than tank #2, possibly twice as fast if usage is very heavy. The continual influx of cold h2o into heater #i will produce more moisture and cause more stress on the steel tank.'
AO Smith notes in their literature that undersizing a gas water heater (which Series mimics for heater #1) can cause 'excessive condensation that will corrode the heater faster. The flue tubes, baffles, and burners are susceptible to hydrocarbons in condensate (wet created inside the vent) and carbonic acid. Continual exposure will weaken the flue tubes. Condensation tin can also spoil combustion and produce a carbon monoxide take a chance. Read almost CO detector and vent test
This ways an overworked heater #1 in Serial configuration volition neglect sooner, and need more than maintenance.
Meanwhile, Parallel heaters do equal work and each heater should last equally long ... IF the Parallel heaters are balanced.

My opinion is that reducing consumption is best strategy for long term. You can add 20 gallon passive tempering tank on incoming cold water line, and/or plow downward thermostat on heater #one to mitigate some issues.
That is not always possible with high density living, or over-consuming households with Niagara-size shower heads, in which case if h2o heaters are in Series, then heater #1 should be expected to fail sooner, and need more than maintenance.
The problem with Series also gives a choice for people who are using onetime heater with a new 1: Employ newest heater for heater #1 so the old one can concluding a bit longer, or use old heater for heater #ane and supplant it when it gives out. The data gives options, merely not an answer for which is all-time.
Resources
How to maintain water heater
How to troubleshoot gas water heater

Effect of water softener on two water heaters
-One softener can supply soft h2o for ii heaters, whatsoever configuration.
-Softener cannot exist put on hot water. It must be installed on cold water.
-You cannot run hot water into softener. Hot water will damage softener.

-Employ pressure reducing valve if water pressure is over 80psi. l psi is good, less pressure level like 40psi and plumbing lasts longer. Use expansion tank if line has cheque valve or pressure reducing valve. Expansion tank is installed on cold water line. Identify and repair h2o heater valves

Consequence of water softener on h2o heaters in general
-Softened water will deplete the anode rod, causing rusted tank
- If you take olfactory property problems, or tanks rust out frequently, the softener is suspect. Decline the softening, or remove softener, or replace anode rod oftentimes, or install power anode rod, or deodorize by adding hydrogen peroxide oftentimes.
Buy: Water softener
Resource : How to replace anode rod
How to deodorize water heater with hydrogen peroxide
How to deodorize h2o heater with bleach Expansion tank and two or more heaters: A single expansion tank volition work, if sized correctly for the pressure.

Heating h2o causes water to expand. Water will non compress, so pressure from heated water pushes out of tank and dorsum into water pipes. Typically the water volition expand harmlessly out to the street or to water well tank and creates no trouble.
But if check valves or pressure reducing valves are installed on the incoming h2o line, so expanding h2o is blocked and has nowhere to go. This creates a 'closed system' where "temperature ascension of just x�F (increasing from 75� to 85�F), increases force per unit area from l psi to 250 psi."
Residential water heater tanks are manufactured to meet 300 psi max when new ... without any rust or defects ... merely for safe, all residential tanks are rated maximum 150 psi..
If pressures exceed 150 psi, then the TP valve will release at 150 psi and drizzle h2o. This condition indicates if a airtight system is present. The TP is not designed for continual performance in this style, or designed to substitute for correctly-sized expansion tank. Moreover, the continual expansion and contraction of high force per unit area will damage tank, cause pipes to burst etc.
Do not not install a TP valve that is rated for college pressures. Each water heater, and or storage tank or tempering tank in the h2o heating organisation must have a correctly-rated TP valve. Resource : TP valve lawmaking

To check pressure : Put a pressure gauge on the water heater drain valve to determine pressure level. Whatsoever incoming water force per unit area over 80psi should have pressure reducing valve installed on incoming cold water line and correctly sized expansion tank located on cold water line between heater and pressure reducing valve.
Some local codes require pressure level tank on all installations. Some locales have a check valve on water meter to stop backpressure coming from homes. Consult local code or plumber or urban center utility.
Buy:
Expansion tanks
Water pressure level gauges
Temperature pressure guess
Resource:
TP valve leak troubleshoot
Troubleshoot water heater valves
Closed system Pressure reducing valve and two or more heaters: A pressure reducing valve is used when incoming water pressure exceeds 80psi. As well much pressure can shorten life of plumbing fixtures, crusade leaks, rupture pipes, and harm heater. A pressure reducing valve tin can create a closed organisation that results in water heater causing too much pressure on the hot water line, thus requiring need for expansion tank with every pressure reducing valve installation.
Buy:
Pressure reducing valves
Pressure regulating valves at Amazon
Resource: Closed system / pdf xx gallon point of use/ Total 40 gallon
Applies to electric water heaters only
twenty gallon signal of use water heaters are electrical
First heater does most of the work

Typically 120 volt water heaters arrive with one element rated 1500 watt.
Chemical element voltage and wattage shows on finish of each element.
Watts divided by volts equal amps
1500 watts divided by 120 volt = 12.5 amps ... use 20 amp billow
1500 watt volition raise half-dozen.nine gallons from lx� to 120� each hour.
Buy:
xx gallon h2o heater

Resources:
Figure volts amps watts for water heater
How to install betoken of use water heater
How to install electric water heater

Gas supply and two h2o heaters:
When adding second gas water heater, total BTU of both heaters must exist calculated. Call local gas company. Read label on side of each tank for BTU rating. For example both heaters together lxxx-100,000 BTU, and gas pipe length is fourscore feet, and so iii/iv" pipe is needed.
Resources:
Gas piping nautical chart
How to install gas water heater

Parallel 2 water heaters with circulating pump / applies to gas or electric heaters

Recirculating arrangement is handy for folks wanting faster hot h2o supply at distant faucets. Ideal home construction clusters usage points near h2o heater to increment efficiency and reduce costs, but many oversized homes and multi-dwellings are not able to meet that level of efficiency and a recirculating pump is chosen for convenience.
Notation: Recirculating pumps have dissimilar installations, and pipe configurations. Some pumps must be installed on vertical section of pipe, and some systems have a direct return line entering the drain valve port.
Resource:
Recirculating systems
Recirculating organisation for Tankless

The problem of distant faucets can be solved with a small point of use heater, plumbed in different ways to run into different needs. Resource: How to install under counter heater

Easiest choice for recirculating arrangement is to have Parallel heaters equally illustrated on left.
Recirculating organization tin as well be used with Series heaters. All the same, in a series organisation, if Timer is used on heater #i, or heater #1 is turned off except when need requires more than hot water, then best recirculating program is straight return line that goes into bleed valve port on heater #two and does non enter both water heaters on the common common cold water line.
.
Resources
How to install gas h2o heater
How to install electrical h2o heater
Recirculating systems

Note about installing 2 gas water heaters.
Residential code for venting gas appliances/ pdf
Venting multiple heaters/ resources pdf

If current installation has 1 gas water heater, then venting and air requirements for ii heaters is different.

Vent: Illustration shows basic connectedness for two-three water heaters on same vent. DO Non ASSUME the numbers apply to every installation or your installation.
Both heaters tin be connected to ane vent, but the vent must meet specifications to meet BTU per 60 minutes operation, number of elbows, horizontal distances, vertical distances.

Air supply: New heaters cannot be installed in a dusty, muddied environs or the air intake screen tin can get clogged and crusade FV failure. Two water heaters mean more air intake into house. The mechanical space might need a laissez passer-thru vent fan to depict air from another part of house.

Gas supply: The gas meter is rated for certain level of BTU consumption. Gas supply line that is designed for 1 heater will not supply plenty gas for a second heater without running larger gas line.. unless total BTU of 2 new heaters is equal to the BTU per hour rating of old heater. Too much BTU draw by one heater or 2 heaters tin can starve other appliances. Call gas company for specifications, or refer to gas chart pdf. Low gas pressure tin be tested using manometer, or more than easily, observe other appliances.

Tankless: Some folks imagine that tankless with solve all issues of hot water. And there are applications where tankless is suitable substitute. But the same issues of vent, air supply, and gas supply also apply to installing tankless to supersede tank-type heater. Why? The tankless must quickly heat water every bit is passes in a pipe, consuming more than fuel per gallon of heated h2o than tank-type heaters.
-The need for greater fuel consumption also produces hotter and more vent by-product, requiring larger stainless steel or PVC vent piping and non the typical galvanized piping used for tank type heaters. The tankless will fail to plow on if incoming cold water exceeds demand. This is specially truthful in winter.
-Other issues include failure of parts if water hardness exceeds 11 grains. A floor drain is needed for acidic condensation that drips down from the vent line.
-Maintenance for tankless exceeds tank-blazon heaters, and includes annual deliming and cleaning h2o filter. Unlike tank-blazon heaters, the tankless cannot be repaired DIY, and local technician might not be qualified to repair your model. I do not recommend tankless.
Resources:
Multiple water heater venting nautical chart/ pdf
Troubleshoot water heater vent
Troubleshoot water heater air supply
Read well-nigh FV failure
Gas pipage sizing .pdf

Ii tankless plumbed in 'opposite'
Plumbed in reverse which is a blazon of parallel requiring identical heaters, with each heater supplying equal corporeality of hot water.
Can combine 2 or more tankless units together
Can be Manifolded together with single controller

-People by and large have notion that tankless heater volition solve all water heating problems ... endless hot water while saving money ... plus a xx year warranty. Each of these is simulated. The warranty is 6 years.
If incoming water temps are too cold, then the amount of hot the tankless can supply drops off ... so in wintertime, the tankless cannot deliver same amount of hot h2o. Information technology's not endless. There are limits.

Saving money? Tankless crave yearly maintenance, like deliming. Tankless accept 700+ parts, while a tank type heater has 20+ parts. Parts are expensive and non generic. Tankless are not DIY repair. Local technician might non exist qualified to work on unit. Service manuals are near non-existent.
Resource: AO Smith tankless error codes, maintenance and parts .pdf

Tankless cannot be exposed to more than xi grains hardness without loss of efficiency then complete failure in few years.
The installation requires larger gas line to supply enough fuel to support the huge burner. The huge burner requires larger flue pipe made of stainless or PVC to support the surge of combustion byproduct each fourth dimension unit of measurement activates.
It defies common physics that you lot tin can speedily rut 'endless hot h2o' using a high-powered burner that requires an oversized flue pipe and use less energy vrs heating less hot water, no matter what kind of water heater. Lower consumption is only fashion to save energy and money.

Boilers and Polaris shown below likewise require large gas lines and venting, and are truly designed to deliver big amounts hot water regardless of season.
Resource:
Rheem diagram .pdf
AO Smith diagram pdf

Larger paradigm
Four heaters plumbed in 'reverse'
Plumbed in reverse which is a type of parallel requiring identical heaters, with each heater supplying equal amount of hot water.

When heaters are plumbed in opposite, and then the first heater to receive common cold water is the last heater to supply hot water. Analogy shows heaters 1234 .... heater 4 receives common cold water first .... so four supplies hot water last.
Heater 1 receives cold h2o last, so 1 supplies hot water offset.

Note: illustration shows high efficiency and  high volume gas condensing heaters, with the vertical vent and condensation bleed located at lesser of heater.
Resource
High-Efficiency-Models.pdf

Larger image
Larger image with more detailed plumbing
Indirect Heater and Boiler ...
Fig 1 shows overview of banality and indirect heater performance. Purpose: abode heating plus hot water.

The banality super-heats hot water using gas or oil at a rate of 150,000-300,000+ BTU per hour producing a temperature range that can reach near-boiling 200�F water (a fatal temperature for humans, bacteria, lobsters etc).

"A h2o heater is an appliance for supplying hot water for residential or commercial use other than
space heating. The maximum outlet water temperature for any h2o heater is 210�F ( 98.5�C)." Designing energy efficient commercial systems .pdf

The boiler performs two functions.
1) Oestrus living infinite by circulating 200 degree water in a continuous loop (boiler loop) from the boiler, through a series of pipes and radiators located in each room, and back to boiler.
ii) Estrus a supply of potable (beverage) h2o past circulating 200 degree water in a loop from the boiler, through the coiled heat exchanger inside indirect heater, and dorsum to boiler.

When connected to a typical boiler, the indirect heater can supply super high volume of potable hot water (200-400 gallons per hour) depending on BTU rating of boiler, specifications of organisation, thermostat setting, temperature of incoming cold water, size of indirect heater, etc.
What size indirect heater is needed

There are different types of indirect water heater designs that receive hot water from external oestrus source .... for instance a geothermal loop, rooftop solar collection organisation, wood burning stove-boiler, etc.
Many designs practise not use indirect heater, and instead circulate potable h2o through a heat source and and so directly back into ordinary water heater or storage tank.
Care must be taken not to exceed tank limits. Some models of Marathon storage tank are rated 170�F. Solar tanks are generally rated for 180�F water temperatures. Some water heater auxiliary storage tanks and some commercial h2o heaters are rated 180+�F (must check specification sheet), while ordinary residential tanks are uniformly rated 150� when new. College temperatures will damage tank past weakening integrity of inlet and outlet welds etc. To foreclose damage, all water heaters are required to have correctly rated TP valve that release water at 210�F. Old tanks with rust would be unsafe at high temperatures and more likely to rupture violently.
Resource: TP valve code

The indirect h2o heater is required for any arrangement that does not circulate clean beverage drinking water, for instance a rooftop solar drove organisation that uses glycol (deadly antifreeze) in the apportionment loop to prevent freezing.Resources Read about glycol water heaters
Glycol, lead and other chemicals can never exist introduced into beverage drinking h2o supply.
Drinking h2o cannot laissez passer through whatsoever pipes that are used or have been used for boiler considering of chemicals (chromates, boiler seal etc) institute in boiler organization, and because of the dangerously high temperatures and pressures of banality water.
Using the indirect heater ensures that drinking water and water from boiler remain separate. If the heat exchanger located inside indirect heater breaks or develops a crack, the indirect heater must be replaced.

Indirect heater supplies potable (drinkable) water to home.
How it works: The indirect heater has a thermostat that is gear up independently of boiler. The thermostat controls a circulation pump. When water inside the indirect heater drops beneath ready point, the pump circulates hot water from the banality, through the heat exchanger, and back to banality in a continuous bike.
When water temperature inside indirect heater reaches thermostat gear up bespeak, for example 120�F, the circulation pump turns off, and water stops moving through the exchanger until thermostat calls for rut again.

Why utilize indirect tank with heat exchanger to supply hot water to dwelling?

i) Potable hot water must be safety for drinking, and cannot exist mixed with hot water used in the boiler organization. The boiler is a closed system that recirculates same water, while drinking water must be introduced fresh with each describe.
2) Super heated hot water from boiler cannot be allowed into household water pipes where pressures could exceed piping rating, and temperatures could exceed tank rating or exceed residential safe standard for scalding (maximum 150� for residential heaters). Very hot water (140-180�F +) can kill, and/or crusade serious fire injuries. Typical bathroom shower temperature is 104�F and rarely much college. Typical thermostat setting on indirect heater might be 120�-135�F, meaning that cold water is mixed with Hot h2o at the shower valve to achieve 104�F temperature. Every production manual for residential h2o heaters recommend 120� thermostat setting. Mixing valve should be installed for whatever thermostat setting higher up 120�F.
Resource:
Advantages mixing valve

The boiler loop is a 'closed organization,' and must take safeguards to minimize loftier pressures and prevent explosion of tanks and pipes that contain super-heated hot water. Boiler MUST be installed, maintained etc by licensed plumber with boiler feel due to high pressure and temperatures from banality...
Not DIY household projection.
Resource
Pipe diagram for 3 boilers
Typical boiler-indirect manuals:
Indirect service manual
Boiler instruction manual
Boiler installation / service manual
Commercial banality install/ service
What size indirect heater is needed Boiler and indirect are truly an 'endless supply of hot water' ... capable of delivering 400+ gallon hot at continual draw earlier becoming too cool to use. Larger image
Condensing heaters ... Since the 2022 free energy standard, whatever household requiring GAS h2o heater larger than 50 gallon, must look to ownership two heaters, or consider a condensing heater.
Polaris is amongst a form of h2o heaters called 'condensing' due to the corporeality of heat recycled from flue and the resulting output of condensed acidic h2o vapor that must be routed into flooring drain. Polaris heater ... ... ultra low nox, ability vented Polaris water heater, with 100,000-199,000 BTU per hr burner and 444 stainless tank and heat exchanger, requires no anode rod and comes in 34 and 50 gallon size.
Purpose: supply big amounts of drinkable hot water with secondary purpose of home heating.
The Polaris has been in use many years. It is not a new introduction.
Polaris has higher efficiency (eighty%) than ordinary atmospheric or power vented heater (60% efficiency).
Efficiency is combined thermal efficiency and standby price of heater including any electricity needed for blower, flue damper etc, but does not cistron purchase cost, longevity, maintenance, repairs, cost of installation, dwelling alterations etc., nor consider environment damage of high-consumption households. The 50 gallon 100,000 to 199,000 BTU per hour Polaris is about same size as ordinary residential water heater (22" bore) merely can supply more hot water than 40,000 BTU water heaters,.

For instance, 50 gallon 100,000 BTU Polaris delivers estimated 100 gallon first hr ... meaning information technology will deliver 100 gallons hot water in single continuous draw earlier water temperature becomes unusable. Recovery 129 gallons per hour. (Depending on temp of incoming cold water and thermostat setting).
The 50 gallon 199,000 BTU Polaris tin can evangelize estimated 170 gallons kickoff hour.
Dissimilarity with ordinary 40 gallon tank heater with first 60 minutes delivery estimate 60+ gallons usable hot water, with recovery twoscore-50 GPH per hour.

The merchandise off for condensing heaters like Polaris is higher toll, more than expensive repairs, larger gas line and gas consumption, more complicated installation (power direct vent), need for make clean electric power and dedicated 120 volt excursion, plus surge protection to protect complex electronic controls are susceptible to surge etc.

Polaris condensing heater uses a blower to draw air into the burner at the bottom of the water heater through an intake pipe from outdoors. A supply of natural gas or propane gas is mixed with air inside the burner located at lowest part of water tank. After burning the fuel, the blower pushes hot combustion past-product through helical-shaped estrus exchanger located within tank before pushing the exhaust by-product out of tank and up a vent piping exiting through side-wall or rooftop terminations. Vent pipage is typical 2-3" PVC as specified in manual.

Polaris heater tin can be integrated with auxiliary storage heater, or integrated with air handler for whole business firm heating ... or used stand up solitary for delivering large volume potable hot water.

Resource:
Review Polaris h2o heater and images
Vertex condensing heater has problem keeping up with high consumption shower
Efficiency: Condensing heaters broadcast hot water through helical oestrus exchanger, raising thermal efficiency. Polaris is rated with thermal efficiency of 94-96%
Thermal efficiency is percentage of rut from burner that is transferred into water ... add thermal efficiency with estimated standby loss = total efficiency.
Polaris has total efficiency around 81%.
Ordinary atmospheric residental gas water heater efficiency is effectually 60%. Retrieve, the EF rating of a heater is not efficiency ... it'southward a formula for computing efficiency that subtracts percentage of tank volume ... with smaller tanks having less volume, and slightly higher efficiency.
Toxic byproducts. Past federal standard any water heater with 100,000+ BTU must exist ultra low nox. Polaris with 100,000 to 199,000 BTU burner is ultra low nox ... releasing 20 PPM (parts per million) NOx. Contrast with typical 40,000 BTU residential ultra depression nox heater that releases xiv PPM. Typical 40,000 BTU residental gas water heater (if not rated for low nox) around 54 PPM.

Total image
Loftier volume system Since the 2022 free energy standard, any household requiring Electric h2o heater larger than l gallon, must look to buying ii heaters, or consider a heat pump water heater. 2 h2o heaters and circulating system
Shows render line installation, aquastat (thermostat) on hot h2o line, and 2-eighty gallon heat pumps.
This illustration shows the bleed vale used as entry point for both cold water and recirculated h2o.
The advantage might be using the open cold water port to add together second anode rod and extend life of tank, or at least extend the length of time between anode rod inspections.

Buy:
Grundfos circulating pumps
Grundfos clip-on aquastats

Resource:
Recirculating arrangement designs
Aquastat transmission
Calculate first hour delivery
Calculate recovery
Supervene upon anode rod
Plumbing for 2 water heaters and Storage tank pdf
Plumbing for 3 h2o heaters pdf
Plumbing for ii water heaters and Recirculating system pdf
AO Smith pipe diagram /pdf
AO Smith pipe diagram /pdf
AO Smith pipe diagram /pdf

Larger image
Super high book system
Storage tank and oestrus pump/ DIY
Purpose to increase storage capacity to meet high volume demand.
Typically, a gas water heater is used for high volume systems, and non rut pump. Storage tanks are available in 150-200 gallon etc and rated for high temperature applications.

Tankless will stall and quit heating when need exceeds parameters of unit of measurement. Fifty-fifty 3 tankless heaters can stall.

Heat pump supplies hot water that circulates into the storage tank.
Storage tank thermostat controls circulating pump, so when h2o drops below set betoken inside storage tank, the rut pump replenishes the hot water.
Storage tank tin can contain super-dangerous 140+�F water. The mixing valve located on top of storage tank, adds cold h2o to the line, and so end user receives 115�F water.
This strategy increases the amount of hot water bachelor to meet high book demand. Typical bath-shower is 104-110�F.
Buy:
AO Smith Storage tank
Rheem thermal storage tank
Resources:
Advantages disadvantages mixing valve
Plumbing for ii h2o heaters and Storage tank pdf

Larger epitome
2 gas water heaters plumbed in reverse (parallel) with a storage tank

Resources:
Storage tank and booster-heater.pdf

Tank plus booster heater
AO-Smith-storage-tank.pdf
Commercial-storage-tank-specs.
Two-heaters-and-storage-tank
Ii-heaters-and-storage-tank

Source: http://waterheatertimer.org/Two-water-heaters.html

Posted by: mcraeopoetinat.blogspot.com

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