Heat output places the machine and it is quoted in Btu per hour across this leaf, running 35,000 at the small end up to 340,000 on the largest Space Warmer bodies. Output is matched to the volume being heated rather than the floor area, since a high roof holds a great deal more air than a plan drawing suggests.
Direct or indirect is the decision that matters most and it is about where the combustion products go. A direct fired heater puts everything, heat and exhaust together, into the space. An indirect machine burns separately and flues the exhaust outside, sending only clean warm air in. Where people are working in the space for long periods, that difference is the whole choice.
Infrared machines work differently again. Rather than heating the air, they warm the surfaces and the people the beam falls on, which suits a large or draughty space where heating the air would be wasted. Sealey hold IR bodies at 13kW and 29kW with 50L tanks, and SIP and Clarke run IDX and IRD infrared machines with flue kits.
Supply voltage matters because these machines need power for the fan and controls even though the heat comes from fuel. Dual voltage 110V and 230V bodies suit site work where only a transformer supply exists. The SIP Fireball XD and ID ranges and the Draper Jet Force ladder run through the middle of the output span. Questions go over WhatsApp on 07754288583.
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