PDP 350,000 BTU Natural Gas Vertical Power Vented Unit Heater

750 sq ft yes it has to be vented

We had to call in a plumber

There is no universal consistent relationship between square footage of floor space or volume and how much heating capacity you need to install. As I am sure you can envision the same structure if located in Alaska is going to need a lot more capacity than it would if located in Florida. The proper way to size heating is to do a heat loss calculation. There are many free programs on line that will do this for you. I use the Slant Fin heat loss calculator, which I have on my phone. It is free download available at the apple or droid ap store. Basically you enter room sizes, window sizes, construction type, geographic location, etc. and the program will calculate how much heat the structure will lose on the coldest hour of the coldest day of the typical year. Selecting the capacity that is matched to the actual load you will get the longest and most efficient run times. Garages are the one place I frequently deviate from the heat loss. Because people often keep their garages cool but then want to heat them up fast to either do a project or melt snow off a car I will often install extra capacity. This allows them raise the temp on a cold winter day in a reasonable period of time. For example I live in Massachusetts and my heat loss called for 30,000 BTU’s of capacity. However I installed the 75,000 BTU unit. I keep my garage at 45 F and with this unit I am able to get it up to comfortable temperature in a reasonable period of time. If I consistently maintained a higher temperature in my garage I probably would not have installed so much extra capacity. Chris 978 651 3301

This particular version comes what Modine calls an aluminized steel heat exchanger. However it can be ordered with a stainless steel heat exchager as a factory installed up grade. If you would like to discuss that feel free to give me a call and we can configure the Model number just the away you want. Chris 978 651 3301

Thank you for your recent inquiry with The Home Depot, Jason. There are too many factors involved other than simply the size of a unit to determine what you need. You can find a guide to help you determine what you need here: http://www.homedepot.com/catalog/pdfImages/78/78631150-1f6c-4f28-9105-1a39ec263297.pdf Page 18 has a guide to help you decide what you need. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.

No this unit is not convertible to liquid propane.

I am sorry but these questions are not routed to a Home Depot representative. Instead they go to the supplier of the product. So I can tell you a lot about Modine Unit heaters, I can not speak to Home Depots installation services which vary throughout the country. I would suggest you contact you r local store and ask for the person who handles installs.