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Old 09-28-21, 11:28 AM   #1
Lurking Renovator
Join Date: Jul 2011
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Default Pre-heat water for hydronic baseboard

My house has a propane heated hydronic baseboard system. Our propane prices fluctuate while our electricity costs are fairly constant. I'm wondering about getting a tankless electric water heater to pre-heat the water going into the hydronic system. My reasoning is that it requires more propane to heat 50F city water to boiling than it would to take 120F to boiling coming from the tankless heater.
Has anyone done this sort of thing before and did you see significant savings in propane costs?

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Old 09-29-21, 04:41 PM   #2
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what are your prices for kWh and propane? what temps do you actually run in the boiler?
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Old 11-01-21, 09:48 PM   #3
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You should not be heating with cold city water, you must recirculate the water.
My hydronic system has a delta T of from 10 to 15 degrees F (the water returning to the boiler only needs heating by about 10 or 15 degrees)
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