Leveraging multi-zone VRF for domestic hydronic heating
There have previously been a number of discussions here about using existing heat-pump infrastructure to also provide auxiliary hot water (for radiant or other purposes).
A couple of years ago, there was a promising discussion around Mitsubishi’s PFWY module (available in the light commercial City Multi system) suggesting that they might get into this space.
I’m currently working with our contractor to specify our HVAC, and we’re planning on using Mitsubishi VRF equipment (likely 1 x 3 Ton and 1×4 Ton unit) with multiple indoor Zones; we have a 450 sq/ft space which we’re planning to add a Hydronic underfloor radiant system to, but ideally, we’d avoid either separate outdoor units, or tankless water heaters so i returned to the PFWY discussion. Looking online, it appears that the unit is still made, but perhaps not compatible with the smaller P-series outdoor units; and it looks like it’s a 32k BTU capacity unit, and I suspect we need much less, perhaps closer to 12k. I wonder if anyone has had any luck exploring options in this space?
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