We found this machine to do the job. We haven't used it for very long, so, I cannot comment on its longevity, but it has been doing a great heating job so far, even heating a 200sqm poly tunnel over night in winter. The 5l tank is okay and doesn't have to be refilled too often. The assembly is easy enough and very straightforward. Attaching the exhaust pipe and the air intake to the bottom cannot be done with a screwdriver, but requires a 6mm ring spanner. Bending the exhaust pipe to fit under the machine takes some strength. The machine is not too heavy to carry, but you wouldn't want to carry it for long distances. Overall, we are very happy with this heater so far. It would be great to have a timer on it, though.