Gas ovens use about 18,000 BTU/hr
Electric Ovens typically have a 3 kilowatt (kW) burner, which equates to about 10,236 BTU/hr
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.
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.
The pricing range of conventional ovens largely depends on the brand and model of the oven. Some conventional ovens cost around fifty USD on average when purchased online.
How hot and how fast? 5,000 btu's will heat it. Not very hot and it will take forever. If you are using it for residential hot water application. Roughly 40,000 BTU's
Range ovens are used as heaters as well as ovens. They stay hot all day all year round (unless you disconnect them).
There are a number of different types of Belling ovens that are produced. Some of the models of ovens offered by Belling are built in ovens, free standing cookers (ovens), range cookers, baby Belling small ovens and microwaves.
14,200 & 12,000 BTU Power burners, two 9,500 BTU standard burers, and one 5,000 BTU simmer burners
You can do them on the DeLonghi 48" Dual Fuel Range with Self-Clean Ovens and Griddle.
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.
Most of the ovens have identical viewing window for the size range. The bigger ovens have bigger windows,for viewing. The electrolux ovens have clearer windows,
Depending on the size you need, commercial ovens can range from 430 dollars to 8500 dollars. The following website offers a variety of commercial ovens to choose from, http://www.rogerandsons.net/showcategory.aspx?CategoryID=3748&SEName=convection-ovens&pagenum=1&PriceSort=2&PriceSortX=2&ManufacturerFilterID=0
That would be the DeLonghi 48" Dual Fuel Range with Self-Clean Ovens and Griddle.