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  #1  
Old 09-23-2021, 04:49 PM
tenman tenman is offline
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Join Date: May 2008
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Location: Ohio, US
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Heater advice/recommendation
Default Heater advice/recommendation

My fab Southern Burner heater has given up the ghost; no longer in business, parts unavailable, so I need a new backup heater in the greenhouse (Ohio, US) in case of main furnace failure or power outage. It must be around 25,000-30,000 BTU, work without electricity, ergo no fan. Needs to work from a standard thermostat connection or have its own thermostat, and come on automatically at the set temperature of ~55F. Any recommendations? The only thing I can find that looks like it might work is an unvented blu flame heater. Does anyone know if those are safe in an enclosed orchid greenhouse? There is a small 3" intake vent for the main heater, and currently an exhaust pipe from the Southern Burner which could be left as a fresh air vent as well if necessary. I would prefer a vented heater like the Southern Burner but can't seem to find one.
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  #2  
Old 09-26-2021, 03:18 PM
claypot claypot is offline
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Heater advice/recommendation
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I have used an "unvented" propane heater in my greenhouses as backup for many years......BUT "unvented" is a misnomer. The key to using these successfully is to ensure adequate ventilation both for the flame to burn cleanly and then at a high level to allow combustion gases to expel. Get those right and you will be fine - compromise and get them wrong and your plants will suffer. The problem is that orchids take so long to show their displeasure that it will be a few weeks before you know success or failure. I have extremely unreliable power supply and have considered switching to propane permanently but we have only "unvented" heaters available here in the UK that I have discounted other than for temporary standby.
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