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Plumbing Configuration for Tankless DHW Coil in Boiler

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Posted by Jeff Gray on August 12, 2005 at 10:14:02:

I am having a new oil fired boiler installed in my home (hot water baseboard heating). I have an electric water heater in place now. I would like to use the tankless coil in the boiler for DHW because it's cheaper, but I've heard from others that have them that they sometimes can't make quite enough water (maybe two showers going at the same time and somebody starts the dishwasher). I would like to use the electric heater's volume as reserve capacity by piping through the tankless coil to the inlet side of the electric heater. In addition to providing reserve for the tankless coil, this configuration would also let me shut down the boiler in the summer without having to change anything. Three questions:

1 - Any reasons this would be a bad idea?

2 - Where should I put the tempering valve? After the tankless coil and before the electric heater, or after the electric heater, or both?

3 - Should I include a bypass valve on the boiler coil or is it OK to send water through the coil all summer.

I'd appreciate any thoughts any of you may have, especially if you have some experience with this configuration.


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