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best gas heater for shed/greenhouse
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.