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I've seen the posts about the recirc pumps, but have not read much about how much electricity they use if I install one. If I have it set to a timer running 18 hours/day, I wonder how much my electric bill will increase? Anyone out there have information on this?
Your mileage will vary. Depends on where the pipes are (crawlspace vs slab vs overhead), how insulated they are, what they're made of, and what temperature the area the pipes go through is kept at.
I have a similar question. If you have a circulator pump with a tankless water heater, is it constantly heating water while the circulator is running? I think this would eliminate any type of savings that might be gained by installing a tankless heater between the electric and gas usage.
I have a switch I hit a few minutes before I shower, so mine only runs a very short time every day. some pumps do run constantly, which runs up the electric and the gas bill. You can use timers, motion sensors, switches, the possibilities are endless
The tankless heater use a special pump designed for tankless heaters and only run on demand...
If you have a tank style water heater we recommend the Grundfo UP15, Grundfos USA the pump is placed on the outlet side of the water heater and the comfort bar is placed in the cabinet under the sink. You can also purchase additional bars and place them under other sinks as well.It is not limited to one area of the home, plus it keeps any noise that the pump may produce to the heater area not in the cabinet.
If you have a tankless water heater you will need to contact the manufacturer of the unit to see what they recommend so it does not void warranty. Most will agree with this one:
http://www.gothotwater.com/D%27MAND/default.asp (http://www.gothotwater.com/Company/default.asp - broken link)
I doubt you would even notice any difference in costs on the electric bill.
We have the RedyTemp, and after much research, I believe it to be the best on the market. It has two different units, one for standard heaters, a special one for tankless heaters.
It goes under the sink in the bathroom farthest from the HW heater. It's so quiet you can't tell it's running. I did have it on a timer to come on in the mornings and evenings when you needed hot water. Now that I'm retired and don't keep regular hours, I have a switch mounted under the counter, so I just turn it on when I want hot water. It takes about two minutes to get hot. The water is recirculated, so you aren't dumping gallons of water down the drain to get hot water.
The pumps that mount at the water heater I didn't like at all. The reviews were not good.
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