Outdoor heat gets hired for three jobs: keeping a crew working, keeping concrete curing, and thawing frozen ground before a dig. The machine differs for each, and the first question at the counter is fuel, because propane, kerosene, piped gas and diesel change what the heater can stand beside and how long it runs alone. Rates start near $45 a day.
Choose the fuel for the site, not the price
Propane burns clean, needs cylinders, and loses output in hard frost as the tank chills. Kerosene and diesel arrive in a can and hold output when cold, though the exhaust is dirtier and the smell carries. Piped natural gas is cheapest to run and ties you to one connection point. Yards keep all four for that reason.
Curing concrete and thawing ground are different hires
Protecting a fresh pour means gentle even heat under cover with the exhaust kept outside, which means an indirect fired unit and ducting. Thawing frozen ground before excavation means a hydronic machine circulating hot glycol through hoses laid under insulated blankets. Neither is the open flame heater a crew stands next to.
How long before someone has to refill it
Match the tank or cylinder to the shift rather than to the rating. A 400,000 BTU diesel unit with a small integral tank may want attention twice in a night, while a towable hydronic heater runs for days off its own supply. For overnight work ask for run time at full output, not tank capacity.
Finding a yard that keeps heat in stock
Temporary heat is seasonal and fleets thin out beyond cold markets. The Census Bureau counts 5,830 equipment rental establishments across 544 counties in all fifty states, which tells you how many yards are near you but never which of them keeps heaters in October. Book early where winters are short and demand spikes.
Questions people ask about rental heaters for outdoors
Can I leave a jobsite heater running overnight?
Only where it is built for it and somebody checks on it. Indirect fired and hydronic units are designed for unattended running with a thermostat; open flame forced air units are not, and many site rules say so. Fuel capacity, rather than the heater, usually sets how long it can be left.
What does temporary heat cost to run?
Fuel is normally the larger half of the bill on a long hire. A 175,000 BTU propane unit at full output empties roughly a hundred pound cylinder inside a day, so price the cylinders alongside the day rate rather than discovering them afterwards.
Do outdoor heaters need a permit?
The heater itself rarely does, but storing fuel on site can, and a fire watch may be required near combustible material. Check with the local fire authority whenever the hire involves more than a couple of cylinders or a bulk tank.