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-   -   On demand tankless water heater (http://www.striped-bass.com/Stripertalk/showthread.php?t=91784)

Slipknot 02-01-2017 10:27 AM

On demand tankless water heater
 
I am researching getting one of these but not sure if it is feasible.
I read that the new washing machines pulse and cause the water heater to try to cycle too fast and don't warm the water, sounds strange but I understand, and there should be no need for an added tank to fix this issue, maybe a small expansion tank of sorts. Has anyone heard of this?

I was looking at Rheem, they have 2 models a 9.5 gpm and a 8.4 gpm. The bigger is $500 more. I have 4 people, 2 baths, the normal dishwasher, washing machine and not usually running 2 showers at a time but does happen. Also a large bathtub jaccuzi that does not get used enough.

http://rheemtanklessonline.com/produ...-water-heater/

I now have 2 water heaters 40 gallon gas in series and never run out of hot water. One has developed a leak so I shut that one down and turned up the heat a little on the remaining one. 11 years on 9 year heaters so it's time to swap out or go with more efficiency.
I like the idea of direct venting because that can eliminate a chimney that is only used now for the water heaters.

Anyone familiar with these?

I found one that has a recirculating pump of some kind http://us.navien.com/Product/Categor...age1/Details/9

this might work

fishbones 02-01-2017 11:47 AM

Bruce, reach out to Bobby (5/0). He's knowledgable about that stuff.
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Ian 04-07-2018 11:08 AM

Just lost my electric tank heater, remembered this thread, any feedback on which way you went and whether you regret it?

Probably going to get a tankless LP model, unless Iím convinced otherwise.
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Slipknot 04-07-2018 04:36 PM

I ended up with a 50 gallon power vent model instead if the instant type water heater for a couple reasons and so far I am happy with that thanks to Bob 5/0.

Ian 04-09-2018 08:19 AM

My plumber talked me out of the same thing. Getting a 50 or 75 put in today
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Pete F. 04-09-2018 09:16 AM

You could also consider a heatpump hot water heater. If your electric rates are favorable and you run a dehumidifier in your basement they can be cost effective. Likely if you have natural gas it may not work out financially.
Here is a calculator
https://www.efficiencymaine.com/at-h...st-comparison/

Ian 04-09-2018 08:34 PM

Quote:

Originally Posted by Pete F. (Post 1140914)
You could also consider a heatpump hot water heater. If your electric rates are favorable and you run a dehumidifier in your basement they can be cost effective. Likely if you have natural gas it may not work out financially.
Here is a calculator
https://www.efficiencymaine.com/at-h...st-comparison/

Ended up going with a propane fired 50 gallon tank. New well pressure tank and heater are in now and water is back to flowing through the house
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Slipknot 04-09-2018 09:19 PM

Cool


I ended up waffling procrastinating a couple months last spring and then my luck ran out and the other water heater let go all at once, had to drain it down and scramble to get a new one before the end of the week, but we got it done in a few days thanks to Bob.

Ian 04-11-2018 07:15 PM

Quote:

Originally Posted by Slipknot (Post 1140948)
Cool


I ended up waffling procrastinating a couple months last spring and then my luck ran out and the other water heater let go all at once, had to drain it down and scramble to get a new one before the end of the week, but we got it done in a few days thanks to Bob.

As with anything, I wish I hadnít waited so I could have done things on my terms, not based on the needs and preferences of the most responsive plumber.

I suppose allís well that ends well
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Guppy 04-12-2018 06:07 AM

3500 views?
Google searches ?


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