My Brother-In-Law finally convened me to buy a hobby car so now I am looking at ways to warm my garage a few degrees during the winter. Of course, it can do double duty as a hot water heater year-round AND a home heater for winter, and there is more heat available in the summer. It does take a long time to heat up a slab and if you are in really cold temps I would think of using a heat exchanger off your tank with maybe glycol running through your slab. A radiant wall heater’s yellow-orange glowing elements produce heat that warms objects directly with infrared rays. Propane heaters are eco-friendly and cheap to run, though both they and natural gas heaters require proper ventilation.
If you keep your house at 70, you will need some heat, and if someone between us likes 60 degrees, she will use exactly half of the amount of heat you use. The other two walls of the garage were already insulated and drywalled, so most of the heat loss was through the metal door. If it is an attached garage I would put my money into insulating it better so less heat is needed. Most vent free heaters have refractory (often called catalytic) heating elements, which are able to burn fuel so efficiently that only traces of combustion by-products (mainly humidity) are left behind. Throw them in at night and when you are away, and cut the heat loss significantly.
However they are not and never will be as efficient as even an indoor conventional wood boiler, due to heat loss in underground and lost heat through the jacket and lost heat from the chimney that would otherwise be inside the building envelope. After I insulated the walls, (they had good quality insulated garage doors too) it took about 15 minutes with the heater running and the ceiling fans turning (drawing the air up) and I was working in my t-shirt and it was -12 outside.
Note that your savings are a bit off (my giant double-door fridge with icemaker uses 564 kWh/year, costing me $56 in wind-generated electricity), but even so, a chest fridge would easily outperform it. But in order for a garage to serve those purposes, the temperature has to be above freezing — and for much of the country that means a source of heat. There are a number of options for heating your garage once you get away from electric space heaters and decide to go with natural gas or propane. You can get the same 50,000 BTU from a kerosene model for under $200 , and 70,000 BTU for around $250 That’s a lot of heat for not a lot of money.
I set up a nice gym in my garage, but the cold seems to come right in no matter what I do. I insulated my garage door with R8 insulation and tried running two types of electric heaters (oil radiator, and hot air blower) but I can’t seem to warm the place up. Electric or gas infra-red radiant will give the most creature-comfort heat in a space like a garage. A tight-fitting curtain or honeycomb blind, or better yet a set of interior shutters, can cut heat loss through the windows in half again. If you spend a lot of time in the garage, consider going with the most BTUs appropriate for the size of your garage.
Above.) The app then calculates your shop’s heat loss in BTUs, which equals the BTU rating of the heater you’ll need. But when the concrete floor has already been poured, this good advice comes too late, Jeffery replies. Yes, the humidity can be a problem at times, so turn on the house heater or crack the garage door. I couldn’t get a car into my garage right now, but some future owner migh revert to doing that, so I use electric heat there. I designed and retrofitted a classic style Central Boiler OWB into my ex’s house that had an electric hydronic floor heating system and an electric DHW. So I heat up the shop for a half hour with the big sucker, turn it off, and turn on the smaller one.
For me, we found that in the summer putting a blanket over our west-facing window made a HUGE difference in solar gain. I have a 220 line in the garage and installed a AC/Heat combination window unit, but then it doesn’t normally get that cold down here. This can create problems with your furnace shortening its life by potentially damaging the heat exchanger (which can be deadly dangerous) and can also cause it to funtion in a way that would be less efficient than before closing the registers. I actually built the box to certain dimensions, based on what scrap materials I had and on the dimensions of my heat collection method – aluminum cans.