![]() Hopefully some competition will come along and improve that situation, but for now, it does not look practical to me, and I'd love to have it be practical. ![]() ThreePhaseEel will be along in a minute to mention "Eco-Cute" outside air-to-water heat pumps using CO2 refrigerant, but the US distributor shortens &/or voids the warranty for a variety of things, including using them for space heating, so that's a very expensive leap of faith if you choose it, since it's hugely expensive and they also void the warranty if you don't have a very expensive plumber install it. And no one does them better than Policrete. In cold climates, you need an actual source of heat to make it work (a cold climate air-to-air air heat pump is one such option.) A ground source (or "water to water") heat pump is another option. Hydronic systems are the most cost-effective, energy-efficient and luxurious way to heat your home. In mild climates where the outside air does not drop below the minimum intake air temperature for the heater, this can work with an outside vent kit. With the XPS and Bekotec, the R-value of the floor should be 9-10. The TOH project house has a manifold in the basement where all the tubing originates and returns. In a first-floor retrofit, all these either already exist or are easy to locate nearby. We will be using appropriate vapor barriers and uncoupling membranes. A radiant floor heating system needs a hot-water supply, a connection between the tubing and the plumbing, and a pump to move the water from one to the other. It's like cooling your house by opening the refrigerator door. Our current plan is to insulate with 1.5 XPS over the slab, lay Schluter Bekotec over the insulation, place the the PEX in the Bekotec, screed then tile thoughout the house. Radiant hydronic floor heating is extremely quiet. Backup heat is still required and can be provided with a wood stove. Radiant floor slabs can have tubing as tight as 6 in. (titled Solar Radiant Floor Heating, such systems typically cost at least 14,000. Depending on the tubing spacing, flexibility can be your most important detail when selecting a hydronic slab tubing. The problem with using a hybrid heat pump to heat your floor slab that heats your house is that the hybrid heat pump pulls heat from the air inside your house. Because of the long lag-time with concrete-slab radiant-floor heating systems. Polaris.) You can also mitigate the cost somewhat by having enough tank to supply a whole year and buying only when it's cheapest (typically in the summer.) ![]() LP is expensive, but you can get very efficient (95+%) propane water heaters ( e.g.
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