Hook up 2 water heaters

enter 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.

How to Drain a Water Heater

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.

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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.

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. 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.


How to Drain a Water Heater

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.

Common Mistakes in Hot Water Heater Installation : Hot Water Heaters

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. Adding a 2nd water heater to do what a storage tank could do, would be more work with gas and flues that you need to do.

If you really want two water heaters, install them in parrallel with equal lengths of pipe between the cold tee and the hot tee, or in a "first in, last out" configuration and you will have a reliable system that uses both heaters equally. So more people say parallel, but what about question 2. Remember- one of these water heaters is seven years old and one of them is brand new-Does that change the answer??

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  • Dual Water Heaters: Parallel Or Series?? - Plumbing - DIY Home Improvement | DIYChatroom.
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Tha water heaters are electric. Broox, It reinforces my answer. In parallel one can be replaced while the other still works. Tankless is not the answer unless you take the full leap. Otherwise you're wasting your time and money. I appreciate Nick's thought about a tankless for preheat but is a waste of money and energy. I do this stuff all the time it is my profession. Series is an inexpensive way to plumb 2 heaters. Engineer is right with his post.


Dual Water Heaters - parallel or series - InterNACHI Inspection Forum

I bounce back and forth between how I like to hook them up I also like to do a little extra work if I do hook them in series I feel that you are thinking of the wrong thing when talking about the age of the water heater I would guess that 9 out of 10 old water heaters we replace are from leaks not from the Heating elements failing Of course this is only a guess I never really counted it and am not sure where I could find this statistic So here is what I would look at.

What do you need the Hot water for? In the First Scenario I would do it in Parallel Water will be drawn off of both water heaters so you will get about 80 gallons of hot water out of 2 50 gallon water heaters the would still be Hot hopefully. Now Scenario 2- I would do series but I would use the first tank as a warming tank in other words as the second water heater uses the Hot water it will pull in the water that is pre-heated from the first tank so it will take less time to heat up between showers.

In my House I have a Water alarm that also shuts off the water in the event of a leak I highly recommend them. I have seen it save a Finished basement When the tank ruptured when the person was away. To get it to pass inspection I removed the Handle from the hot side valve. Broox, Even if you look at your 2nd scenario. If piped properly and you leave room in the vertical drops to the heaters, for varied heights of different heaters.

Is there an inexpensive pump available that could pull the water from my basement water heater once cooled through a window approximately 4 ft. I am having no luck draining a hot water tank at a camp, that pulls from a very hard, sediment prone water supply. I drain the tank every year for the winter, but this year nothing will drain out. Do you think there a lot of sediment buildup? How do I drain the tank that is totally blocked? Can I feed a coathanger thru the valve to clear a way? I am afraid I will ruin the valve and not be able to stop the flow onto the floor if it should free up.

Hi Steve, The reason you should cool the hot water in the tank down before draining is that garden hoses are not usually designed for very hot water. Also, hot water can kill plants or grass in your yard. Just turn of the power to the water heater, then run the hot water in the house or take a shower until it cools down some before draining the water heater. Good luck with your project! Your site says to never drain water when it is hot. We have an electic water heater.

Do you just turn it off and wait for the water to cool down? If so, how long? It should be a closed loop that only drains when you open the valve or if the pressure builds up too much and causes the pressure relief valve to open.