instead of that go to grundfus.com and look at the domestic water circulating pump. there the best

dcwesley,

Good to talk to another Hoosier - Go Colts!

All tankless heaters vary the amount of heat up to a point. The point that they stop is the maximum capacity of the heater. You design for that worst case.

So, for example, if you have a faucet that is 2gpm and you are in central Indiana where the water temp can be 35 degrees F in the winter, you will need a heater that's capable of heating 2gpm 70 degrees (to 105). If it will do that, it will be fine the rest of the year.

For Point of use, I would expect that you are thinking electric. I would still plumb that in series with the hot water - rather than from the cold water line.

All electric heaters are 100% efficient (close enough) - one brand isn't going to get more heat out of the same amount of electricity than another brand. You will need to size it according to the above example, though.

Just an interesting FYI: I know that many gas tankless units will not only vary the amount of heat, but they will throttle the water flow also in order to maintain the proper temperature.

Jake -

Thank you for the reply. You are right that I am looking at electirc. I am guessing it will be 240w.

You have helped to confirm what I qas thinking - 2gpm with a max rise of 70 degrees. I need to search more. The Point of Use tankless electric heaters I have researched so far do not appear to have that range.

My husband originally thought we should plumb it with the hot water line- but the first couple we looked at were marked as requiring plumbed to cold only.

I can't wait for Sunday. I have declared we will stop the renovtion work long enough to watch the game. (Here's to a healthy Freeney.)

Keep in mind also one can run the faucet at less than 2 GPM and get more effective temp-rise from the tankless. Think about that ... 2 GPM fills a one gallon jug in 30 seconds. It's not often that a kitchen faucet must be run at that flow-rate to get the job done -- washing hands, rinsing dishes, filling a sink to wash dishes, etc.

dadoes - I think that is an excellent point - and I concur, but I will never convince my husband of that. He only knows one speed in everything he does - full POWER!! (A little "Tim Allen" like.) Frankly I can live with waiting for the hot water, but this is high on his list.

Have you thought of installing a small tank instead, like 6 gal?

Thanks for the suggestionl. We have looked at 4 - 6 gallon tnks as well. Our sink cabinet is on the small size - 24" wide - so with the garbage disposal underneath the sink the remianing room is fairly limited. I was thinking tankless would help on that front.