This is always a difficult problem to balance cost versus effectiveness. What about heating with a pellet stove?
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Tom Eckert (Wednesday, 17 December 2014 14:06)
Installed a pellet stove this fall for winter heating in the 20 by 36 greenhouse. I installed it in the attached 18 by 20 head house. I have an LP heater as the backup. In the past I used wood and
coal for heat but that is a lot more work and the coal is a very dirty heat source but it really created the heat. The cost of coal over the years increased a lot.
This year so far I am satisfied with the pellet stove since the system is very clean burning. I did design a heat collection duck off the stove to move the heat into the greenhouse. This works very
good. We have not had nights below 20 degrees yet so ....
All pellet stoves do require that the "burning platform" be cleaned daily to keep the stove in proper burning condition. This is a simple operation, takes about 3 minutes after the stove is shut
down, and needs done.
Bernie (Sunday, 20 September 2015 08:03)
Winter is coming and it is always the question how to reduce your heating bills. I have considered putting two layers of plastic film with a blower in between on the roof but that is too big of job.
Hope to hear suggestions that a 93 old greenhouse hobbyist can handle.
Construct one or more mini-greenhouses inside your greenhouse that you can heat to the needs of certain plants. Heat the rest of the greenhouse to just above freezing, being careful to check if any
spaces are below freezing. The main areas will keep plants alive over the winter at minimum cost of heat.
I've used jugs of water (large ones, 2-5 gallon) along the inside perimeter of the greenhouse to capture solar heat for greenhouse. Takes up a bit of floor space, if your greenhouse is crowded, but
seems to work. Also, I use a radiator type oil heater on lowest setting, doesn't even show up on my electric bill and keeps the greenhouse above freezing (in the 40's); I only turn it up to the next
lowest setting if we get a cold spell (20's) that lasts for several days.
just one layer of 6 mil UV resistant poly would do a lot when on top of an existing glass greenhouse. hopefully one winter will not promote rot if framing/mullions are wood
yep - the double layer with fan inflation would be a chore - for anyone at any age
Bernie (Saturday, 17 October 2015 08:13)
Knowing that using electricity as a source of heating is expensive. I like to learn what space heater is the best from energy cost.
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Tom Eckert (Monday, 07 August 2017 13:01)
Update on the Pellet Stove in the greenhouse. I now recommend not trying to use a pellet stove in the greenhouse. The stove developed problems with the auger because they used a steel auger, should
have been stainless steel I think, and brass bushings for mounting. The auger rusted over the summer months and locked up the supply system. After that repair the "metering unit" locked up also.
These units do not like moisture. The company that makes them, Avalon, would not provide a new unit but wanted me crate and send the stove back to them in CA for repair. That would have cost a
fortune. I scrapped the stove.
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