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Incorporating off-peak with outdoor wood boiler
Happy Saturday all, I had a customer call yesterday and ask about adding an off-peak electric boiler to his existing hydronic system which is currently heated with an outdoor wood boiler. It seems to be piped properly, with a 100 plate HX and single circ feeding 3 zones of radiant slab. 2 zones in the house at 4 loops each, total 2000 sq ft as well as a 1500 sq ft garage on the 3rd zone. While I would typically install the electric boiler in series with the plate as a backup, he wants to retain the wood boiler for the garage while using the off-peak for the house but still keep the wood source for on-peak hours with automatic switchover. I've been pondering it for a day and have drawn it out several times, but short of basically building a second system in parallel with the existing and cutting in tees to feed the zones with added zone valves I am not having much luck with a seamless piping diagram. I feel like there is a better way, possibly implementing a 3 way to bypass the plate HX but if the garage and house happen to call at the same time that will not work with what I have envisioned. Anyone have any great ideas?
Before you ask, I have no idea why he wants to keep the garage on the OWB but not the house. "Because".