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best gas heater for shed/greenhouse

in Gas Heating
Hello everyone i'm new here and need some advice. I have a well built shed 12' x 18' and i want to add a lean to greenhouse [21' x 10'. I have natural gas heat [Navian] in the main house. The sheds about 50' behind the house. The total sq ft is around 450 but the greenhouse is only about a 3 R rating [6mm double wall GE plastic]. I think the most cost effective way is to trench the gas to the shed and use a high efficiency gas/hot air burner. Was looking at Rinnai FC510N or FC824N no vent heater, or a Monterey 25,000 BTU Natural Gas Top-Vent Wall Furnace. I assume the Rinnai is much more efficient but i'm worried about the safety no vent. The Williams burner fits IN the wall and has a rear vent option so i could maybe heat shed and greenhouse as i plan on a large opening between them. Will the Rannai save a lot and the no vent a good way to go? I'm sure there's other options, i'd like to here your onions. Thanks.
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Comments
I doubt that the difference in efficiency is that much -- certainly not enough to justify using a no-vent in that type of application.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
https://www.rinnai.us/documentation/downloads/R-CNHT-E-07.pdf
And I might add that for some farmers, at least -- and the OP may be one -- a greenhouse isn't a luxury at all, but the only way to grow some of the crops which the market demands.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
My statement covered that possibility, but then it becomes about profitability. I could be wrong, it is just my opinion. Maybe there is an efficient way to heat a greenhouse. You know better, than I.
One of the things which made his work great was that he recognized the limits of the technology...
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
On the heating side, it seems like r-value and green house are oxymoronic. They are typically energy pigs.
Root zone heating is another method, where warming the soil, not necessarily the entire volume of the space, is adequate.
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
http://grist.org/climate-energy/amory-lovins-high-tech-home-skimps-on-energy-but-not-on-comfort/
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me