Best way to hook up two water heaters

Is there a way to hook up dual electric water heaters on one circuit? I think i read somewhere that you could disable one heating element in each so your total electric draw would be the same as a single heater. Why would you want to do that? In many water heaters unhooking an element in each one wouldn't work because only one element comes on at a time. You could either have one tank heating at a time, or you would be overloading the circuit. IN some heaters both elements come on simultaneously, so your theory could work.

Installing Multiple Water Heaters

Home Search waterheatertimer. Two water heaters How to recycle water heaters. Install two water heaters E-mail: Cold water feeds into 1 heater: Applies to gas and electric water heaters 1st water heater feeds into 2nd water heater Advantages: Double water heating capacity, avoid buying large expensive water heater, lets you fill oversized bathtub without buying 80 gallon heat pump water heater.

Uses first heater more than second, unless first heater is on timer. Cold water feeds into 2 heaters Applies to gas and electric water heaters Cold water feeds into both water heaters. Use this design when house has water line to two parts of house. Turn 1 water heater off except when needed, avoid buying large expensive water heater, lets you supply different temperature water to areas of home.

Twice as much hot water available. How to control cost: Water heater installation kit Shark bite water heater connection Resources: Tempering tank Compare timers 9 ways to save Add another thermostat to water heater Advantages mixing valve How to increase amount of hot water. Turn up water heater thermostats and add mixing valve to moderate temperature on pipe going to bathroom and allow hotter water on pipe going to washing machine.

The first heater does most of the work and wears out sooner How to control cost: Mixing valve Temperature needed to kill bacteria Tempering tank Compare timers. Cold water feeds into 2 heaters: Option 1 2 separate hot water lines for different parts of house. Increase heating capacity without buying large, expensive heater Advantage from series: The first heater does most of the work.

Mitigate problem by using the second heater for less-used part of home. Plumber's note about terminology: This is not considered parallel piping according to plumbers. This is just two water heaters sitting next to each other, but is labeled 'parallel' on this webpage for organizational purposes. Parallel option 1 shown above is an actual parallel system, and requires the piping on hot and cold to be equal for the heaters to draw down equal. Paralel is defined as: Having equal number of fittings; as well as, lengths of pipe.

Increase heating capacity without buying large, expensive heater Disadvantage from series: Uses both heaters equally, but requires both heaters to operate, and cannot add timer to one heater. One heater will supply more than the other heater. Obstructions in the pipe can effect outcome, so fresh plumbing should be installed on both heaters.

Both water heaters must be ON, and set to same temperature. If one water heater is turned off, then it will add cold water to the line while other water heater supplies hot. This means a timer cannot be added to one heater and not the other. Ball valve Brass gate valve 40 gallon electric water heater 40 gallon gas water heater. If water heaters are different size different heights , then measure pipes and install so both pipes are same length to the point where they meet.

Pipe diameter, elbows and distance must be identical, for the Hot to be drawn equally. How to Balance two water heaters The sources I've read, indicate that precise balancing is hard to do One strategy might be to set the thermostat different on each water heater. Set container under TP overflow tube, open TP valve on each heater and get baseline temperature using cooking thermometer, then average two temps. Run Hot tap at bathtub and measure temperature How you would correct the difference, and possibly balance heater, is to keep adjusting thermostats until average is reached.

Which is the best design, Series or Parallel? First off, Parallel is a challenge getting each water heater to balance into equal draw. It might be impossible unless heaters are identical BTU rating and gallonage, and there is no guarantee that the pair will stay balanced over time. Does this means Series is better? In my opinion yes, because 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 now and then.

Sales manager from Lochinvar pointed out a disadvantage for Series that should be noted. He says 'if both tanks are used continually, then tank 1 is doing most the work, and will wear out sooner than tank 2, possibly twice as fast if usage is very heavy. The continual influx of cold water into heater 1 will produce more moisture and cause more stress on the steel tank.

The flue tubes, baffles, and burners are susceptible to hydrocarbons in condensate moisture created inside the vent and carbonic acid. Continual exposure will weaken the flue tubes. Condensation can also spoil combustion and produce a carbon monoxide hazard. Read about CO detector and vent test This means an overworked heater 1 in Series configuration will fail sooner, and need more 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. That is not always possible with high density living, or over-consuming households with Niagara-size shower heads, in which case if water heaters are in Series, then heater 1 should be expected to fail sooner, and need more maintenance.

The problem with Series also gives a choice for people who are using old heater with a new one: Use newest heater for heater 1 so the old one can last a bit longer, or use old heater for heater 1 and replace it when it gives out. The information gives options, but not an answer for which is best. 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 water for two heaters, any configuration. It must be installed on cold water. Hot water will damage softener. Use expansion tank if line has check valve or pressure reducing valve. Expansion tank is installed on cold water line. Identify and repair water heater valves Effect of water softener on water heaters in general -Softener can cause odor problems on rural water well.

Turn down the softening, or remove softener, or replace anode rod frequently, or install power anode rod, or add hydrogen peroxide frequently. Water softener Resource: How to replace anode rod Expansion tank and two or more heaters: A single expansion tank will work, depending on valves and other plumbing factors such as check valves. Purpose of expansion tank is to prevent problems created when pressure from heated water inside tank is confined and not allowed to expand due to installation of valves and check valves installed on the hot water line.

Too much pressure can damage tank, cause pipes to burst, cause TP valve to drizzle or weep hot water. Put a pressure gauge on the water heater drain valve to determine pressure Anything over 80psi should have expansion tank. Some local codes require pressure tank on all installations. Consult local code. Match expansion tank size, to your water heating system. Expansion tanks Water pressure gauges Temperature pressure gauge Resources: TP valve leak troubleshoot Troubleshoot water heater valves Pressure reducing valve and two or more heaters: A pressure reducing valve is used when incoming water pressure exceeds 80psi.

Too much pressure can shorten life of plumbing fixtures, cause leaks, rupture pipes, and damage heater. A pressure reducing valve can create a closed system 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. Pressure reducing valves Pressure regulating valves at Amazon Resource: Element voltage and wattage shows on end of each element.

Figure volts amps watts for water heater How to install point of use water heater How to install electric water heater. Gas supply and two water heaters: When adding second gas water heater, total BTU of both heaters must be calculated. Call local gas company. Read label on side of each tank for BTU rating. Gas pipe chart How to install gas water heater. Ideal home construction clusters usage points near water heater to increase 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.

Recirculating pumps have different installations, and piping configurations. Some pumps must be installed on vertical section of pipe, and some systems have a direct return line entering the drain valve port. How to install under counter heater Easiest choice for recirculating system is to have Parallel heaters as illustrated on left.

Recirculating system can also be used with Series heaters. However, in a series system, if Timer is used on heater 1, or heater 1 is turned off except when demand requires more hot water, then best recirculating plan is direct return line that goes into drain valve port on heater 2 and does not enter both water heaters on the common cold water line.

Multiple water heaters can be installed in two primary methods that are very similar; series Points to consider when connecting water heaters in series are. A: The best method for you will definitely have to take into consideration your Foam insulation allows two 40 gallon or two 50 gallon electric water heaters to be have to be partially backed up with your conventional electric water heater to.

Is there a way to hook up dual electric water heaters on one circuit? I think i read somewhere that you could disable one heating element in each so your total electric draw would be the same as a single heater. Why would you want to do that?

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InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. Here we describe the plumbing connections and piping options for hot water system hook-ups.

Two Water Heaters in Series

Multiple water heater installations are predominantly for commercial or industrial applications where a high capacity of heated water may be required during peek times; however some residential homes may also benefit if they have large volume fixtures such as a jetted tub or hot tub. When designing a potable water system, great care must be taken to fully anticipate the current and future demands of heated water. If you need help determining the expected hot water requirements check here- A. Smith's sizing guide for commercial hot water applications. Multiple water heaters can be installed in two primary methods that are very similar; series connections and parallel connections, each having its own benefits and drawbacks depending on the desired result. When water heaters are connected in series it means the cold water is fed through each tank; one after the other, with the first tank's hot outlet becoming the next tanks cold inlet.

Two water heaters in parallel

Log in or Sign up. Aug 17, Location: Kansas City. A four plex i looked at has two 40 gal water heaters plumbed in parallel supplying hot water to all four units, plus two wash machines in the basement. One water heater needs replacing. Tennants have always complained about lack of hot water. Im looking at options to improve the situation. Replace the two 40 gal with one gal. Replace both 40's with two 50 gal. Plumbed in parallel.

I want to change my method of heating water for my home. However, I'm getting confused as I discover all the different ways that a household can produce hot water.

Currently we have a 2 year old 50 gallon natural gas water heater is not providing enough hot water for our needs on busy mornings when 6 people have to shower in a short period of time. So, I would like to add a second water heater. For various reasons I would prefer not to install at tankless heater in the new bathroom.

FIRST PROBLEM: Turning off a hot water heater.

Home Search waterheatertimer. Two water heaters How to recycle water heaters. Install two water heaters E-mail: Cold water feeds into 1 heater: Applies to gas and electric water heaters 1st water heater feeds into 2nd water heater Advantages: Double water heating capacity, avoid buying large expensive water heater, lets you fill oversized bathtub without buying 80 gallon heat pump water heater. Uses first heater more than second, unless first heater is on timer. Cold water feeds into 2 heaters Applies to gas and electric water heaters Cold water feeds into both water heaters. Use this design when house has water line to two parts of house. Turn 1 water heater off except when needed, avoid buying large expensive water heater, lets you supply different temperature water to areas of home. Twice as much hot water available.

FIRST PROBLEM: Turning off a hot water heater.

By in series, I mean cold water flows into the first water heater, then the hot water flows into the second water heater, then distributed. I didn't set this up. I'm doing an HI and was being challenged. Just wanted some confirmation. Electric water heaters in series works very well, I have mine setup this way. I just turn the power on the 2nd tank when we have company. Why would you want cold water entering both tanks and preventing the use of a whole tank of hot water as would be the case with a parallel setup?

Two water heaters in parallel

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