Do you have to have more than one tankless water heaters installed?
Posted on | December 5, 2011 | 2 Comments
I am looking at installing a tankless water heater but, I’m not sure if I’m understanding them correctly. I understand there’s point of use which go by where you’re going to use them but I’m wondering are there any tankless water heaters that you only need one for the hole house? We don’t have a big house at all and we just need to heat the shower and the kitchen sink which are directly next to eachother besides a wall being inbetween them. I’m hoping I will just need one to heat the sink and shower. Instead of having to buy 2. Please and thank you!
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2 Responses to “Do you have to have more than one tankless water heaters installed?”
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December 5th, 2011 @ 9:50 am
There are two kinds of tankless systems, point of use, and the other kind is for a whole house. Point of use is more popular in Europe and Asia, and whole house systems are more popular in the United States.
One benefit of point-of-use is that you can individually set the temperature for each fixture. Another benefit is that pretty much as soon as you turn the hot water on, you get hot water (instant hot water). For a whole house system, you have to wait until the hot water travels from the heater to your tap, unless you get a recirculating system. But recirculating systems use extra energy because it is constantly recirculating and heating the water.
I have a whole house tankless system in my house, it is the Rinnai brand, and I think they only do whole-house systems. We have 2 bathrooms, and our kitchen includes a dishwasher. But if you really only have a shower and a sink that use hot water, it may be cheaper still for you to get two point of use systems. We would have needed 7 point of use systems in our house (4 sinks, dishwasher, 2 showers), which is why we chose the whole house system. We did not choose to do the recirculating system, so it takes about a minute for the water to get hot in our upstairs bathroom.
To install a whole-house system, you may need some electrical or gas upgrades. Our system install cost a total of $5000 because we needed a bigger gas pipe to our house.
December 5th, 2011 @ 10:49 am
Depends on the water needs of your house, and the rate of delivery of the tank. Unless you have a large household, with the need of hot water to multiple sources simultaneously, one tank is fine.