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Old 11-05-2017, 04:57 AM   #1
Movick
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Default Thinking About Tankless

Hello,

I am preparing to replace an 80 gallon electric water heater in the Spring of 2018 (American Water Heater Model: E62-80H-045DV) as a DIY. I am considering going with a tank-less water heater as the current monster resides in an under-staircase closet, which also houses my whole house filter. Getting to the whole house filter (I have well water) is very cumbersome with the huge tank in the way and I would really appreciate the extra space and easier access. At this time, a tank-less unit is the same or less costly than a direct replacement heater.

The builder's plumber installed an anti-sweat mixing valve with 1/2" copper to all the toilets (see attached image) and I am wondering if the tank-less (on-demand) water heater will cause issues with this set-up?

I am thinking about installing the tank-less heater on the inlet wall - below the copper. I am curious if I will need to re-plumb everything coming in with hard copper or can I sweat thread-on fittings and use flex to the tank-less?

I have 220 volts already to the current water heater.

Any advice is greatly appreciated!!

Thanks in advance!

Mov



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Old 11-05-2017, 11:03 AM   #2
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I am not a plumber so can't help with the plumbing. I am an electrical contractor.

Make sure you check electrical requirements for the tankless unit. The tankless will likely use a much larger circuit which will force you to add a new larger 220 volt circuit for it.

They use larger circuits because they have to heat instantly rather than slowly in a large tank.


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Old 11-05-2017, 11:02 PM   #3
Movick
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Thanks for that Wooddude.

I researched the electrical aspect of tank-less, and right in line with your suggestion, I determined that I will need a service and panel upgrade. I can save a few bucks and run the 8/2 wires, but I'll have to get a few estimates as to the cost of a bigger panel and a higher amp service. Currently my 80 gallon heater uses one double pole 30 amp breaker; a 36KW tank-less heater requires 4 x 40 amp double pole breakers!! I will also need a 250 amp service - jeez!!

All things considered, I may simply downsize my giant 80 gallon heater with a 52; I am the only full time resident here and I think the 80 gallon is overkill. We will see.

Thanks again!

Mov
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Old 11-06-2017, 03:31 AM   #4
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I personally would not waste my money on a tankless unless I had natural gas to heat it.
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Old 11-06-2017, 12:28 PM   #5
Movick
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Just to be perfectly clear, installing a tank-less heater would not serve solely to un-stuff my mattress of annoying, sleep-robbing cash.

(1) I really could use more space in my under-stair closet to access the whole house filters and well pump system.

(2) The unit Walter H. White installed in his family's utility room looked pretty friggen' cool.
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Old 11-06-2017, 02:47 PM   #6
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I don't remember Walter White's water heater, but sure loved the show!
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Old 11-06-2017, 11:00 PM   #7
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Me too; watched the entire series pilot to finale multiple times!

And yes, I know Walt's was gas - I have no way to vent mine, hence electric.



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Old 12-06-2017, 04:12 PM   #8
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I switched to a "whole house" tankless electric heater from an LP std water heater.
Even with the price of electricity is higher here than LP, I save more than $ 30 per month.
you might try something like that- https://www.yourbestpicks.com/best-t...aters-reviews/



Last edited by alozcarney; 12-07-2017 at 03:23 PM.
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