I bought a 2nd hand gas space heater the other day for the garage. It's something I've been wanting for some time in order to continue working on the GT6 rebuild in comfort, but painting a cupboard in the garage has added some criticality to the need, just to assist the paint in drying.
Paid £40 for one on Farcebook Market. It's really powerful and heats the garage really fast, but it doesn't half rip through the gas. I thought I'd test it with the remains of some gas I had left in my SafeFill refillable gas bottle that I use for the motorhome, but it only lasted about an hour. It burns 2.46 litres of liquid gas (1.2kg - approx) per hour at full tilt while belting out 107,000 Btu (31.4kW), although you can turn the burn rate down. 31kW is more than enough - my 12.5kW wood burner in the house heats both upstairs and downstairs with no effort.
It wouldn't be so bad if the garage had insulation, but it doesn't. The workshop at the back does, but the walls of the garage are just ply and cladding, so the heat escapes rather fast.
The price of LPG at garage forecourts has gone through the roof. A year ago would could get it at around 59p - 89p per litre, depending on fuel station, but now it's around £1.09 per litre (although you can occasionally find it for less), but still a lot cheaper than propane bought in bottles. At £55 for a 19kg bottle of propane, that works out to £1.43 per litre (LPG at the pumps is purchased in litres, whereas propane in bottles is sold in kilograms and 1 litre of LPG or propane is 0.493kg).
That said, the SafeFill bottles have become so popular that they've also shot through the roof in price.
I usually refill my SafeFill bottle at a Morrison's at Cribbs Causeway in Filton, which is my nearest LPG emporium, but it's a rather hit and miss affair. Sometimes I have no problem, but many times I can't get any gas into the bottle at all and have to give up.
Looking up on the internet as to whether anyone else in the motorhome community was having similar problems highlighted that Morrison's gas connections are particularly renowned for not behaving as they should. It was recommended to replace the existing Safe-Fill gas connector with a modified one that facilitates a tighter connection with LPG dispensers - so I ordered one at £18.
Now, if I want to use the GT6 rotisserie as a rotisserie in the true sense, i.e. with a pig stuck on it, I can use the space heater as a BBQ underneath it ....