Chris Hauser

The laborer is worthy of his reward.

Dale Hodgins wrote:Welcome Chris. I don't think you need the barrel. Just a burn tube with the coil at the upper end would do it. The barrel is all about creating a pump and radiating heat to a room. Check out the water heater on Geofff Lawton's site. It's here somewhere too, but I don't know the title. . Someone drop it in please.

Those water jacketed units don't allow high enough temperatures for clean combustion.
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I just hit 3000 posts. That's a lot.

He has an interesting method, I like it. With outdoor home heating boilers the outdoor water is not mixed with domestic, it uses a heat exchanger. Geoff's heat exchanger is a coil through a heated mass non-pressurized water tank. While white boarding the design he says the air from the burn swirls around the water tank, not sure if that is natural turbulence or he has deflectors. Below is a screen grab off his video of the design. Anyone know if the water in the coil would thermosyphon if the height/distance to a spa was correct?

I saw one of these:



It follows the same principle of the house heating outdoor boilers but much smaller. There is a water jacket around the fire. I'd like to make a DIY rocket version and sketched one with coils wrapped around the duct that normally would be in the cob mass. Read an older posting here and it was recommended not to water jacket the barrel, instead coil the first five feet of the duct with the hot water push nearest the barrel and the siphon side on the other end. I suppose the exit under the barrel could go to the duct either straight out then up (as shown), straight up next to the barrel or wrap around the base before going up. The box with the pink is insulation around the coil. It was suggested that this placement would not rob the barrel of the heat needed for good combustion. As this would be outdoors near the hot tub, the heat off the barrel would be wasted as far as heating the tub. Any ideas on how to grab that barrel heat for the water without killing the clean rocket combustion, thanks.