Peter B. Onde wrote:I'd like to have a batchbox RMH. But I'm afraid that something will fail someday. So is the insurance company - if the house burns down as a result of not using a certified fireplace, they will not cover.
Peter B. Onde wrote:An outdoor wood furnace is an option. It's expensive though. And while living in a place where weather doesn't cooperate in regards to keeping wood dry during transport. Hence it's necessary to have a large firewood storage in the same building as the heater. (That way the heater also helps drying the firewood.)
What I really want is a DIY outdoor furnace, clean burning with firewood storage.
Heating the greenhouse, I'm sure the RMH will do fine. It's even possible to build the heater house next to the greenhouse so that the barrel gets inside the greenhouse. The challenge will be to get most of the heat into the mass under the house - that's where most of the energy is needed.
I'm thinking of various ways to achieve that - getting more energy into the circulating water than into the room where the heater is. One way would be to cover the barrel within a coil og waterpipes. (Putting the pipes inside the barrel I think will be too hot for the piping.) Then I could put isolation outside the coil. But then the barrel probably will be overheated. One way to deal with that problem could be to NOT use a metal barrel, but rather build a "barrel" of firebricks. Then make a coil of piping around and over this "brickbarrel", and lots of isolation outside this. This may introduce another issue - In a regular RMH he barrel has a cooling effect on the exhaust. This effect may be crucial to the airflow through the burn chamber. How can that be solved? Maybe by using a metal barrel without top at the bottom and extend with a "brickbarrel" on top of that?
Does anyone have experience with isolating the barrel of a RMH? Or stacking two barrels on top of each other? How did this affect the heater?