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Old 07-23-2012, 03:30 PM   #31
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Wiring for an electric tankless water heater


Or if you switch to natural gas because its so cheap now any, why not go with a high efficiency AO Smith Vertex water heater. Just about everything you get with tankless (10 minute heat time from ambient) in a conventional sized unit. You can't run these out of hot water. No "cold water sandwich" issues like tankless either.

DIY install is same difficulty as a standard WH.

http://www.hotwater.com/water-heater...ex/power-vent/


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Old 07-23-2012, 03:45 PM   #32
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Wiring for an electric tankless water heater


I have to concure with gas tank over electric tankless. Even a gas tank heater is cheaper overall than a gas tankless. When you factor in the payback on a gas tankless....about the time you get into the payback....it's pretty much at the end of it's life.

Gas vs electric? No comparison.....

If it's instant hot water you want...then look into recirc systems....

Hard to beat a gas water heater for simplicity and reliability.
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Old 07-23-2012, 03:57 PM   #33
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Wiring for an electric tankless water heater


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Originally Posted by ddawg16 View Post
I have to concure with gas tank over electric tankless. Even a gas tank heater is cheaper overall than a gas tankless. When you factor in the payback on a gas tankless....about the time you get into the payback.....
And one of the selling points of the tankless is that it doesn't have to "continually" heat the stored water. Well, tank heaters do not either. Once a tank is brought up to operating temperature, the newer tanks are so well insulated that the do not operate unless a substancial amount of hot water is used. And I do know this first hand. When I replaced my hot water boiler, the gas supply was shut off to the water heater as well. 8 hours later when I relit the water heater, it didn't fire up. Turns out that it can easily sit for 8 hours and maintain the temperature without "continually" firing as the tankless advertisements would lead you to believe.
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Old 07-23-2012, 04:20 PM   #34
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Wiring for an electric tankless water heater


Agreed... We have a 50 gallon gas fired direct vent water heater and when no hot water is being used it seems to cycle about once every 6-8 hours. Not bad for 8 years old IMO.

I researched the tankless gas heaters too because I was sure they were the greatest things ever... After all the reading and skimming threads on here, I think a unit very similar to what I have will be installed when the time comes.
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Old 07-23-2012, 08:56 PM   #35
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Wiring for an electric tankless water heater


W use a tankless water heater 28.8kw model and it's great we have had it about ten years. But you should really know what's going on when you install one. And check with the warranty whether it's covered in a DIY install. And POCO really like to know that you have one installed to make sure that the transformer can handle it without a lot of flickering lights.
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Old 07-25-2012, 08:38 PM   #36
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Wiring for an electric tankless water heater


Here is a pic of my Rinnai DIY install. Local plumbing company quoted me $1900 to replace a 75 gallon power-vent gas HWT. Got this from Amazon for $850. Another $200 in supplies and vent pipe and a Saturday and I was good to go.

Edit: Not sure why pic went sideways. Heater is installed vertically.
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Old 07-25-2012, 08:43 PM   #37
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Wiring for an electric tankless water heater


You installed it sideways??
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Old 07-26-2012, 07:19 PM   #38
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Wiring for an electric tankless water heater


Where's the drip leg for that gas line?
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Old 07-26-2012, 07:46 PM   #39
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Wiring for an electric tankless water heater


It's there. That bottom fitting is a tee.
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Old 07-26-2012, 10:20 PM   #40
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Wiring for an electric tankless water heater


I installed an LP tankless water heater for my folks. Pretty easy with the right amount of research ahead of time. Went from electric to LP and they are saving about 50-60 bucks a month in Electric costs alone.
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Old 07-26-2012, 10:29 PM   #41
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Originally Posted by kmk7110 View Post
I installed an LP tankless water heater for my folks. Pretty easy with the right amount of research ahead of time. Went from electric to LP and they are saving about 50-60 bucks a month in Electric costs alone.
How many people in the house? That seems extremely high for just a water heater.

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