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cominsk

09:58AM | 01/05/05
Member Since: 01/04/05
1 lifetime posts
Bvplumbing
I installed a tankless water heater last year and it works great. Cut down on gas bills significantly. Also bought but haven't installed a hot water circulation pump with a timer. Two questions; (1) By circulationg the hot water to cut down on having to run the water, for at least two minutes to get hot water, am I defeating the purpose of the tankless heater. (2) The installation requires that I install it at the ****hest fixture. The kitchen (downstairs) and the master bath take about the same time to get hot water. The master bath is right above the kitchen. How do I determine which fixture is fathest away.

LonnythePlumber

11:05AM | 01/05/05
Most circulators don't move enough water to make the tankless units fire up. And if they fire up you don't want it running all the time. I have not installed a circulation unit on a tankless but I know there's some additional considerations. I am also not familiar with the units that do not require a return line. I would check with your units manufacturer.

Separately, the furthest line in your case is probably your choice. Either the branch from the trunk to the bathroom or the kitchen will not get circulated but it will be a much shorter run. If you can do this I would put it where you want the hot the quickest.

I am pleased to hear that your gas bills lowered significantly.
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