back boilers

[welderman]

i have a large shed come greenhouse on a allotment is there any way i can fit raddiators in greenhouse without power i can make a fire to make hot water buy do i need a pump how did old back boillers work

[welderman]

i have a woodburning stove already the end of the greenhouse isnt worm enough to propogate seeds

[Old_Geezer]

I'm unsure about the H&S aspect, but wouldn't a small paraffin heater do the trick ?

[regulo]

Back boilers were gravity feed. They used large bore pipework, and relied on the fact that circulation would occur due to the water returning from the radiators being cooler than the hot flowing to the rads. Not sure how you'd get it to work in your situation, maybe just 2 rads joined up? One next to your woodburner, one at the far end of the shed.