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TutHillTiger
LSU Fan
Mississippi Alabama
Member since Sep 2010
23567 posts
 Online 

Electric tankless water heaters
We looked at this years ago with gas but the installation was ridiculous due to new lines they would have a huge mess. We are looking at putting in electric tankless now and maybe boosters. Does anyone have any knowledge or experience with them. Any advice appreciated.


tigeralum06
LSU Fan
Member since Oct 2007
2091 posts

re: Electric tankless water heaters
Don't do it. They have to be serviced annually. They will likely break in less than 7 years.


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SSpaniel
Memphis Fan
Germantown
Member since Feb 2013
23362 posts
 Online 

re: Electric tankless water heaters
Ask this on the Home/Garden broad. You're likely to get better responses.


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Philzilla2k
Atlanta Braves Fan
Member since Oct 2017
3569 posts
 Online 

re: Electric tankless water heaters
if only...


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tigeraddict
LSU Fan
Baton Rouge
Member since Mar 2007
8087 posts

re: Electric tankless water heaters
i would not do electric tankless, only Gas. to raise the temperate of one gallon of water 1 degrees F you need:

8.25 BTU/Gal*F

a 100,000 BTU gas heater with equally efficiencies need a 30 kW electric water heater.

for a 30 kW load you need a 240v 150 amp circuit

otherwise, lowering the kW will lower the capacity



PipelineBaw
LSU Fan
TX
Member since Jan 2019
1386 posts

re: Electric tankless water heaters
Go with a gas tankless if you can. We switched to that a couple years back and have had zero issues. The electric types we looked at cost way more when you factored in the energy pull and maintenance


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MikeBRLA
LSU Fan
Baton Rouge
Member since Jun 2005
11923 posts
 Online 

re: Electric tankless water heaters
quote:

would not do electric tankless, only Gas.


This


TutHillTiger
LSU Fan
Mississippi Alabama
Member since Sep 2010
23567 posts
 Online 

re: Electric tankless water heaters
We have a home and garden board, sorry didn’t know


SeafoodPlatter
LSU Fan
Member since Jul 2012
398 posts

re: Electric tankless water heaters
As a former plumber,dont do it. Tankless heaters are only viable in a gas setup. It's actually more cost effective to have a dedicated propane tank to solely fuel a tankless heater than to have an electric one. If you dont have access to NG and dont want to foot the bill for propane, get a standard electric heater (or 2) and recirculating pumps


mikelbr
LSU Fan
Baton Rouge
Member since Apr 2008
36547 posts

re: Electric tankless water heaters
Everything I've read says Electric Tankless is way to go. They are much cheaper, last longer, and are efficient. The only real benefit of gas is being able to heat up more Gallons Per Minute.

Gas vs Electric


quote:


Gas tankless water heaters are designed to last 20 years.
Gas units are more difficult to service because they have a complex heat exchanger.
Warranties vary, but it's common to see a 10 year warranty for a heat exchanger, 5 years for other parts, and 1 year for labor.
Service life can be negatively impacted if the unit is not serviced on a regular basis.


Electric Tankless Water Heater
Electric tankless water heaters often exceed a 20 year lifespan because of the simplicity of their design.
Warranties vary, but parts are typically covered for 5 years and labor for 1 year.
When problems occur, an electric unit is easier to troubleshoot, diagnose and repair.
This post was edited on 11/7 at 9:15 am


notsince98
Missouri Fan
KC, MO
Member since Oct 2012
11645 posts

re: Electric tankless water heaters
quote:

They are much cheaper, last longer, and are efficient


Up front yes, they are cheaper. They "should" last longer because they are simple but sometimes hard water throws a wrench in things.

Efficiency.....this is a tricky one. Yes, an electric water heater is 100% efficient. This leads many to think it is cheaper to run than gas because it is more efficient. That would be a bad assumption. The price of NG and even propane is such that it is very rare for electric water heating to be lower cost than NG water heating. So for a $/heated gallon of water efficiency calculation, gas would be more efficient based on $ consumption.
This post was edited on 11/7 at 9:58 am


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Clames
LSU Fan
Member since Oct 2010
11889 posts

re: Electric tankless water heaters
You are going to have most tell you to avoid electric tankless, mainly those who have virtually zero experience with them and have absolutely zero experience installing them. I've installed gas and electric in residential and commercial settings and there are several cases where electric tankless is easily the better choice over gas. Especially in POU applications, gas tankless is almost idiotic there. It comes down to individual needs, expectations, and the practical realities around installation more than simple-minded gas over electric arguments you'll see posted here.


BeepNode
The City of Central
Member since Feb 2014
1804 posts

re: Electric tankless water heaters
I’m keeping an eye on convos like these because I’m definitely interested in going tankless. The gas water heater in my attic appears to be in good shape but is 10 years old.

I like the idea of having something much lighter up there. Never felt like it was positioned properly over a wall.


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mdomingue
LSU Fan
Lafayette, LA
Member since Nov 2010
11390 posts

re: Electric tankless water heaters
quote:

Especially in POU applications, gas tankless is almost idiotic there.


Absolutely a fact.

quote:

It comes down to individual needs, expectations, and the practical realities around installation


Absolutely true. The drawback to a retrofitted whole house tank-less system is the likelihood that your service will be undersized and require you to replace your feed to the house and at least modify your service entrance if not replace your main breaker panel.

If electric is your only option, odds are a standard, well insulated water heater is likely as good a choice as any.

The newer Hybrid or heat pump style water heaters with storage tanks are supposed to be somewhat more efficient but they are still new to me and I am unsure how well they will last. I would consider trying one of those if I had to use an electric.



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Lion4Life
LSU Fan
Louisiana
Member since Sep 2012
308 posts

re: Electric tankless water heaters
In a new build where natural gas is not an option. What would the suggestion be?
Propane Tankless
Electric Tankless
Electric Tank

I can’t find anything really reliable online to help make an educated decision. I’m looking for that balance between cost vs energy efficiency


notsince98
Missouri Fan
KC, MO
Member since Oct 2012
11645 posts

re: Electric tankless water heaters
Operating cost would favor propane tankless most likely.

Overall lowest cost would likely be a propane tank water heater.


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cave canem
Mississippi St. Fan
pullarius dominus
Member since Oct 2012
11175 posts

re: Electric tankless water heaters
quote:

Tankless heaters are only viable in a gas setup.


While not super popular in the US there are hundreds of millions of them in use around the world.

They are the worldwide standard these days.


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Chuker
LSU Fan
St George, Louisiana
Member since Nov 2015
7544 posts

re: Electric tankless water heaters
What are your reasons for a tankless?

Electric tankless are only slightly more efficient than tank version. The "standby" losses are negligible and even less when a tank blanket is used. Gas tankless are a fair bit more efficient than their gas tank counterparts.


I don't have an issue with running out of hot water so I went back with a tank. Easypeasy. If you need endless hot water then maybe a tankless will be the way to go but they draw hella power so hopefully you have room and capacity in your panel for 3 2-pole breakers. Electric tankless would be a great option for a vacation home imo.



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