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Hydronic Radiant Heating for Pole Barn - What is best heating source option
I am looking for some options for heating my 36 x 56 x 14 pole barn which will have a hydronic radiant heat tubing installed in the next couple of weeks. I will have a vapor barrier, 3" of foamular 250 insulation, wire mesh with 5/8" pex raised on risers to 2" and a 6" concrete pad. I plan on installing 1 to 2" of insulation on the edge of the pad before backfilling. Pex will be installed at 12" spacing. Ceiling and walls will be insulated, but not sure what R value yet - likely up to 30 on ceiling and 15 on walls. Climate is St. Louis, MO and the shop will only be needed to be heated to 60 degrees or so. Not a daily use shop, but I understand once you heat your mass you should maintain the heat. Also plan on having a finished loft 16x36 that I would like to heat and cool (could use mini split or window AC/heat unit or add radiant to the floor with a window AC). Currently electric rates for electric heating from my coop is at 6.2592 cents/Kwh.
We only have electric onsite and would rather stay away from adding a propane tank unless I am forced...
Some of the ideas I am floating right now:
1.) tankless electric water heater - Not sure longevity of this install as I have heard some people replacing fairly frequently.
2.) Geothermal - thinking water to water or a combination unit. I can install loop myself with help from friends and a backhoe, but would need to buy the unit and have a professional hookup. Also if installing a combination unit I could heat and cool the loft as well...Problem with this option is tax credits expired as of 12/31/2016...
3.) hybrid water heater or standard electric water heater - not sure if these units would keep up with the heat demand - experience anyone?
4.) Electric boiler - Cost for size needed and energy usage? Propane boiler if I have to for cost and efficiency.
5.) Would consider solar water, but not sure how it performs and the overall costs...
6.) Compost hydronic heating - install large compost pile and cycle water/glycol through manifold and pex tubing in floor...Jean Paine method - It's free (except mine and friend's time and labor) and usually lasts 12-18 months for heating... I only need about 4-5 months of heating...
Any help would be greatly appreciated. I would love to hear some of the costs associated to installing and operating some of the options above and whether you are satisfied with its performance.