Pyramax industrial ovens are highly rated and provide optimum BTU. They have many options which can be customized with precise heating and cooling levels with programmable transfers.
Not all double gas wall ovens have the same number of BTUs. For instance, BlueStar makes a double gas wall oven that has a 25,000 BTU burner and one that has a 30,000 BTU burner.
The largest I know of are the MCM Range of Industrial Portable Air Conditioners. They do a 23,000 BTU, a 28,000 BTU and a 35,000 BTU.
The Electrolux EI30MH55GS Microwave oven can be mounted over high-performance cooktops, with up to 56,000 BTU of total heat output.
Any industrial propane heater will have thousands of BTU's, but will cost a small fortune. Find one in the middle that works well for you.
I would suggest this website: http://www.nutemp.com/rental_heating.htm. They have many different models available from 400,000 BTU all the way up to 4,500,000 BTU, enough to heat a large warehouse.
Best I can tell from the model number is three (3) Ton. The no. 36 in the model number stands for 36,000 btu's. There is 12,000 btu's per ton.
BTU x 1,055.056 = joules
There are two measures used to describe the cooling capacity of an air conditioner. One is BTU or 'British Thermal Unit' but that is the old way of doing it. The modern way is the Kw or Kilowatt of cooling. to get BTU you have to multiply Kw by 3412. A small air conditioner for maybe one person in a little office might be 9000 BTU or 2.6 kW, a large industrial air conditioner for a bigger area might be 35,000 BTU or 10.26 kW.
Air conditioners come in different sizes. For a portable air condition for a small area, you'll probably want 12,000 BTU or higher. The larger the space you want to cool, the more BTU's you should have.
BTU
The answer: 17070 BTU The math: 3414 BTU = 1 KVA (KW) so 5 KVA = 17070 BTU
70000 BTU/hr = 20.5kW > 70000 BTU/min = 1230.9kW > 70000 BTU/sec = 73854.2kW