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re: Tankless Water Heater Question

Posted on 5/28/21 at 8:32 am to
Posted by zachtiger
St. Francisville
Member since Oct 2007
223 posts
Posted on 5/28/21 at 8:32 am to
@LSU_postman, how does the 7.0 gallon work for your entire home? I am about to install a 9.0 gallon and wondering if its big enough for a 2600 sq ft home?? Appreciate any info
Posted by AlxTgr
Kyre Banorg
Member since Oct 2003
81955 posts
Posted on 5/28/21 at 9:22 am to
quote:

You might be underestimating how big of a generator you need to run a tank less water heater.

Huh? Why would it need much power? Gas is doing the hard work.
Posted by jmorr34
Baton Rouge
Member since Sep 2004
2911 posts
Posted on 5/28/21 at 9:26 am to
quote:

@LSU_postman, how does the 7.0 gallon work for your entire home? I am about to install a 9.0 gallon and wondering if its big enough for a 2600 sq ft home?? Appreciate any info


I have a 10 gallon for 3000sq ft. I think the # of faucets is the more important factor. We have 3 full bath, kitchen, and laundry sink. Haven't had an issue yet. 9 gallon should be perfect. Only issue I have is that it takes longer to heat up than my old tank heater.
This post was edited on 5/28/21 at 9:32 am
Posted by BiggerBear
Redbone Country
Member since Sep 2011
2933 posts
Posted on 5/28/21 at 12:28 pm to
quote:

Huh? Why would it need much power? Gas is doing the hard work.


The OP didn't say whether he wants a gas or electric tankless water heater and different posters are apparently assuming different kinds.
Posted by AlxTgr
Kyre Banorg
Member since Oct 2003
81955 posts
Posted on 5/28/21 at 1:37 pm to
He said to "run a..." without asking which kind.
Posted by offshoretrash
Farmerville, La
Member since Aug 2008
10184 posts
Posted on 5/28/21 at 5:13 pm to
quote:

Small one



I didn't want to go too small. It will be electric and I don't imagine I'll be needing to use hot water when the power is out.
Posted by zachtiger
St. Francisville
Member since Oct 2007
223 posts
Posted on 5/29/21 at 11:26 am to
@jmorr - yeah I’ve heard that....especially if it’s a long run across the house. Mine will be installed on the opposite side of my master suite which I am assuming will cause a delay. Thinking of adding a medium size tank heater on one side of the house to help with the delay and to avoid any issues when the power goes out. Thanks for the info
Posted by shell01
Marianna, FL
Member since Jul 2014
793 posts
Posted on 5/29/21 at 2:52 pm to
quote:

You might be underestimating how big of a generator you need to run a tank less water heater.


We have a 9.9 gpm tankless propane Rinnai, and it only consumes 81 watts while running, 1.3 on standby. Your generator won't even notice it.
Posted by shell01
Marianna, FL
Member since Jul 2014
793 posts
Posted on 5/29/21 at 2:59 pm to
Electric tankless are power pigs. The only way an electric tankless makes sense is for a small point-of-use heater.
Posted by SeafoodPlatter
Member since Jul 2012
664 posts
Posted on 5/29/21 at 7:57 pm to
quote:

jmorr34

If you're having noticeable delay times consider having a recirculating pump and required piping installed
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