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Geospring Heat Pump Water Heater + Tankless Coil

I have a steam boiler (oil) and am in the process of adding a GE Geospring Heat Pump water heater. In heat pump mode, the unit should be able to handle all of my hot water needs for 3/4 of the year (I'm in New England), but winter would pose a challenge, as the basement is unheated and on the cool side. I'd like to add a circulation loop to the tankless coil on the boiler that would only be called when the boiler was already sending steam to the radiators (in the morning and evening when we'd most likely shower and use the dishwasher).

My questions are: Is that set-up feasable  (and worth the trouble)?

If it is, would I set it up like a regular boiler/hot-water storage tank combo:Cold water supply to tee at the drain, circulator to the cold feed at the boiler, pressure relief valve after the hot supply out of the boiler, boiler heated water to the Geospring cold water in. I've attached an image of a similar tank/boiler combo, although the Geospring's cold water inlet is at the top of the unit.

tia, jerryjay
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