If that isn't a problem, it's probably the best way to do this, and certainly the most widely available heat pump to hydronic option. Water-to-Water Heat Pump (ground source hydronic heat pump) seems to be somewhat more common, but ground source tends to have high installation cost (relatively low operation cost, however, due to a stable source of non-varying temperature to work from.) It either takes a lot of excavation or drilling a couple of wells, and that runs to money. I'll probably install a wood-burning boiler for it eventually. For the moment, the hydronic tubing in my slab is idle. So I purchased an air-to-air cold weather minisplit system with a servicing dealer in my area. Getting that heat into water is a far more fickle beast - there are a few companies making Air-to-Water heat pumps, and at least one of those is a Canadian firm that claims operation to -25F - but they have no dealers in my area, and self-importing a system without a service person or dealer available was a bridge too far for my taste. The cold-weather air-to-airs are also generally far more efficient at cooling, as a bonus. Run-of-the-mill whole-house heat pumps (that are mostly air conditioners) do indeed crap out around 30F as Lee Sam comments - but there is better tech available if you can find a dealer and know what you are looking for. As such, they also work fine at 10F which you need. It's certainly possible - whether you can get someone in your area to install and service it, and whether you can afford it, are two entirely different questions.Īir source heat pumps that are designed for it can operate efficiently below 0☏ - many mini splits qualify, and few whole house units do, for whatever reason. I just want to be well-informed about what my options are as I start looking for installers. Note, I'm not planning on doing any of this work myself. I have no idea whether a ground-source heat pump is feasible on my site. The climate is hardiness zone 5b, although in practice it doesn't go below 10 ☏. Would it be feasible to run that off the same outdoor unit as the heating equipment? (I don't want to use the mini-split itself for heat - I have high ceilings, and the hot air from the indoor units doesn't really reach the lower half of the room.) I also have a mini-split AC system already installed. Is it reasonable to do all this with a heat pump instead? (I'd rule out an electric resistance boiler as too inefficient - electricity is relatively expensive in my area.) The total floor surface area covered by the radiant heat is about 1000 sqft. Another loop from the boiler heats a hot water storage tank. It's heated by a hydronic radiant system, fed by a propane boiler. I want to electrify the heating in my house.
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