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There's been a few people on a large internet forum that have imported them from china. I reached out to a company advertising one with a nearly 7.0 COP R290 air source heat pump, $3K landed for the 18kW unit. Definitely on my radar.

This 1000% and I give almost everyone this same advice. The tubing is the least expensive thing you will buy when it comes to the floor, maybe the vapor barrier plastic, but other than that there's no reason not to. You can't put it in after the pour unless you pour it again, so it's literally...

https://senville.com/24000-btu-floor-mounted-mini-split-air-conditioner-heat-pump-sena-24hf-if/ Instructions show ceiling mount install as well as wall.

Propane furnaces do not like running out of gas, great way to soot up the heat exchanger... hopefully it has a low pressure cutoff.

This looks just like the senville floor/ceiling unit I installed this week. Did the pioneer come with mounting hardware for the indoor unit?

Well done!

Wow nobody posted the $2 2x4 deal from last weekend? Limit 100... stocked up again for projects.

If you can run NG to the shop then that's a no-brainer. A modern NG condensing high efficiency tankless water heater or boiler in place of that tanked unit and let it rip. The 15-58 pump wont be enough for a tankless water heater since they are designed with 50+psi of domestic supply pressure...

Not direct fire, has a burn chamber. Flue is the 1" stainless pipe.

I may have missed it but does this zone have a flow control valve? Possible flow loss?

I've read but not tested that some RV antifreeze (propylene glycol) helps out. High concentrations it is flammable. If you have an outlet near it, get a cheap stickyback heating pad for it that draws a few watts. https://nfsa.org/itm-2-2/antifreeze/

Schrader valve like a tire valve stem on the opposite side of the water fitting. Set cold to 15psi then set system water pressure to 15.

Did you adjust the air pressure in the expansion tank to match the system pressure when cold?

Great advice. I've seen free 20-30 gallon oilless compressors that burned up from being ran all day with good tanks.

Again, no issues, regular pex, regular T8 bulbs, and before them it was a single 400w metal halide.

If the cost makes sense you can run it in electrical conduit as mentioned previously, if you need to shield it from direct sunlight say right in front of a window etc. Use straight sticks of it. PEX-AL-PEX is nice because you can bend it and it stays but is more expensive and so are the...

Of course! Be sure to bring the system up to about 15psi before putting into service.

I hear you on this, but how much dissolved oxygen is in the average domestic water supply that heater is built to endure? There's no cast iron boiler being used here.

This is the correct response. Source: FIA, Inc. https://share.google/YgCzl6BAVY7D0LMDm @OP, it did run for 18 years so need to find out what changed, you mentioned the heater is acting erraticaly, any more info? Are you charging system to 15psi of pressure before putting it in service? I'd...

40x60x16, plumbed with 3/4" and 1/2" standard PEX with crimp fittings back in 2010. No issues. Some ran in wall some ran surface mount. PEX goes to a 4-5" black pipe ******/tee drop leg that mounts to framing better than pex, then to 1/4 air fittings. Use it after your cooler/dryer and it's...