domestic hot water

kevin coppinger_4

a series of tankless water heaters....two or 3..kpc

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jim_155

domestic hot water

i want to install the most efficient domestic hot water system in my house.i need to draw 12gpm for ten minutes then a continuos 6gpm.i have low pressure nat.gas.what is the best way to do this? thanks jim.

Southside

Ummm, define "most efficient"

If you are looking at input btu/gallon or $$$/gallon? A 6 gpm instant with a couple storage tanks with heat maintenance may be the lowest $$$ and not too bad for input BTUs. A large boiler and a couple or 3 indirects might cost a little more but be more efficient in terms of BTUs.

Or as another poster suggested, just line up several instant heaters and pay $$$$$$$$$$$$$$$ up front.

jp_2

6 gpm

that 180,000 btu's per hour??

what are you doing? how long do you need 6gpm? how often do you require these draws?

ScottMP

I have a shower head

and a handheld. I use the handheld like a body spray. At 2.5 each 5 gpm is not that outragous ... Is it ??

Scott

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Bruce M

Noritz

You can use a Noritz 1321 series tankless heater. You can see them here.

http://www.noritz.com/homeowners/products/

ALH_4

Lochinvar Armor

The Lochinvar Armor costs more, but it's a lot more efficient than a Noritz.

Home Depot Employee

Takagi

Depending on your incoming average water temp and gas capacity available along with outlet temp required you may be able to use 2- Takagi TK3. These units come with the cord required to sequence the operation. I have 9 GPM and mine work Great!!!!

Larry Weingarten

Whatever...

... you do, add a GFX shower heat exchanger and capture 60% of the heat going down the drain. Then you can buy less heating equipment ;~)

Yours, Larry

Shane_2

The GFX heat exchanger sounds like a good idea, but what about Legionnares disease and the water sitting in that drain when not in use?

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Larry Weingarten

The GFX is a double wall heat exchanger, vertically oriented. The waste line part of it drains and the clean water side is basically like any other cold pipe in a house and is flushed with each use. I have not heard nor do I think Legionnaires is a risk with the GFX. So, don't worry, be happy ;~)

Yours, Larry

Mike Dunn

I like it

This thing is cool. I will be installing one in the next house project I do for sure.