View Full Version : On demand tankless water heater


Slipknot
02-01-2017, 10:27 AM
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/product/rtgh-95dvln-condensing-tankless-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/Category-NPE-A%20series/Page1/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-home/home-energy-savings-program/water-heating-cost-comparison/

Ian
04-09-2018, 08:34 PM
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-home/home-energy-savings-program/water-heating-cost-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
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 ?