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Post by gurbian on Jun 24, 2012 13:34:50 GMT -8
Hi everybody I'm new to all of this but have read a lot already. I've read elsewhere that the RHM doesn't really work if its smaller than 6". I'm due to start experimenting in a couple of weeks and was hoping to try a 5" or even 4" system. I want to build a heater for my garage or greenhouse but have hardly any space (not enough room for oil barrel) hence the need for small system. hope this makes sense
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hpmer
Full Member
Posts: 240
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Post by hpmer on Jun 24, 2012 14:30:56 GMT -8
4" will work. I've built 4, 6 and 7inchers and have noticed a marked improvement with each larger size. I'm currently building an 8 inch cook stove/bbq which may prove a bit too big but I'm curious to see what the output is on the "standard" size stove compared to my other attempts.
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Post by gurbian on Jun 26, 2012 11:30:17 GMT -8
Thanks After giving further thought i'd probably be wise to start off building a six inch one following the guidelines in the book and seeing how i get on. Anyway one of the problems i'm having here in the Uk is sourcing a barrel smaller than a 45 gallon oil drum. So its going to be a six inches to start with
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Post by Donkey on Jun 27, 2012 11:26:30 GMT -8
Just remember that the model in the book is an 8 inch model. You can follow the design pattern and do quite well, if you follow the numbers stated in the book, you may be off by quite a bit.
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Jul 1, 2012 9:24:28 GMT -8
If you need a new 24 Imp gallon drum (110 litre) Patrico in Tewkesbury do them.
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Post by gurbian on Jul 2, 2012 14:50:23 GMT -8
Thanks morticcio, thats not to far from where I live. As for the heat riser i've seen some cheap second hand flue pipes, but they're all enamel coated, anybody know if this is a problem
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Post by woodburner on Jul 14, 2012 20:41:56 GMT -8
It won't be a problem if you use insulation round the riser that sets, like a clay/sand/pearlite mixture, as the flue pipe will just be a former that burns away anyway. You could even use a cardboard tube for the riser, it just burns away a bit sooner.
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