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misfitmorgan
Herd Master
You might want to reconsider the tankless water heater. We have one, got it when half the house was rebuilt 4 years ago. It is useful only when taking a shower. For small uses it is really inefficient and water using appliances (dishwasher, clothes washer) use very little these days. I doubt the washer ever gets the proper temp water, at least at the beginning, since it puts in a little water, spins, puts in some water, spins, etc. The on demand isn't on long enough to heat that water at all.
Your well water is likely the same temp as ours which means maybe 45°. The basement even in the summer is only about 60°. I've watched the temp guage on the temperature control valve. It takes several minutes to get up to even 100°, longer to get to 120°. Thus you are sending a lot of tepid water through the pipes before you finally get hot water. With water starting at 120° you aren't wasting nearly as much.
Then there are the "rapid cycle" things. It goes on after it senses 1/2 gal/min for 3 seconds. Unless you leave the water running, you build up a lot of "cold pockets" in the pipe. The place where I first ran into that was shaving then showering. I don't use an electric, all the little rinses don't kick the heater on so when I got to the shower it was hot at first, then cooled, then got hot again. So you have a choice, waste gas by leaving the water running when you aren't using it or living with colder "hot" water.
Your better bet is a hybrid. It will use the heat pump when it can, electric elements otherwise. I didn't replace the on demand with one though because the heat pump needs minimum 60° water and if that is what I have in the summer, I'm screwed in the winter. The basement gets down to freezing sometimes. I had to put a heat tape on the intake and outlet pipes of the pressure tank (they froze one year) and run the condensate drain for the on demand water heater to a bucket because the water in the condensate pump freezes. The pump HAS to be basically on the floor since the bottom of the water heater is only about 12" up.
If the (soon to be your) water heater is NOT in the basement or the basement stays warmer, look into a hybrid.
I had one of the early tankless models and it worked great maybe the newer ones are junk now i dunno. I do have an old style fill then wash washer not a newer spray and spin type though i will be buying those a well with in a few years. Not sure on the well water temps for here. We may just replace with a standard hot water heater then i was just wanting to have a smaller heater for the most part because of its location in the basement. You have to go down the stairs and around the furnace and hot water heater to the corner of the basement where the washer/dryer live, seems like it would get annoying after while.
The furnace and hot water heater are both in the basement right next to each other. I assume the basement stays warmer but i dont know, i do know the furance is a 120,000btu model. Also found it is an Amana GL 120 and the manual for it was printed in 1967. I called Amana about a replacement gas valve and they told me the model number wasnt long enough according to the parts department, until i told her the manual for it was from 1967. She asked me to send her a picture of the metal plate for the furnace so i have but im pretty sure the answer is going to be, we dont have a part for it.