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Old 03-14-2012, 12:53 AM   #1
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Tankless water heater


I have an electric tankless water heater that is curently fed from the hot water (potable) return line of my boiler. So hot water is getting heated from my boiler and again through my electric tankless water heater then distributed throughout the house for drinking and showers etc. Is this a waste of electricity and/or heating fuel. it makes more sence to me to hook it up to the cold water supply of the boiler so i am not stealing hot water from it and forcing my furnace to kick on that much more. if i do hook it up to the cold water supply, can i just cap the hot water return for the potable water? i feel like im wasting fuel and electricity when i could just be using one source to heat water when now i am using two.

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Old 03-14-2012, 04:24 AM   #2
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Tankless water heater


Depends on the size of the electric heater.

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Old 03-15-2012, 05:38 AM   #3
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Tankless water heater


Your tankless only kicks on if the desired temperature is not reached. Your unit came with paperwork that shows the flow rate in gallons per minute based upon incoming water temperature and desired outgoing water temperature.

for instance, my max output temp is 140 degrees. At that temp, I get about 3.5 gallons per minute if my incoming water temperature is 70 degrees. If the incoming temperature is 120 degrees, the flow rate would increase dramatically, and it would not draw much juice to make it happen.
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Old 03-16-2012, 01:23 PM   #4
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Tankless water heater


I wouldn't run it off the boiler line, thats water (make-up) the boiler would have to heat, during the winter when you need it most. our tankless is only going to heat it to a certain temp and only when it is flowing. I can't see a whole lot of savings. JMO.
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