Howdy, I've been lurking around here for a while gleaning info in Rocket Stoves and Rocket Mass
Heaters. This community is awesome, these forums really feel like what the internet used to be like prior to social media, it's great. But to get to my question;
I am scheming on building J style
rocket mass heater (stove?) that will be submerged (mostly) in
water with the intent of heating up a bushcraft hot tub made out of a
pond liner in a hole.
I understand that there will be big thermal losses with this being an uninsulated mass of water, and I presume there is no way I would be able to get
enough heat into the water using a heat exchanger coil.
My idea is to use a J shaped stove/heater made out of 6" steel tubing. Both ends will be tall enough to extend above the water, and I will use rocks on top of the burn chamber to prevent the stove from floating. I have read enough here to know that building rocket mass heaters out of steel is a bad idea. But for this use case the temperatures experienced by the burn chamber material will be mitigated by the fact that it will be surrounded by water. I'd also like to make it out of 1/16" thick material to keep the weight down, as I will be hiking it in about 6 miles.
Does anyone have any
experience with something like this? Thanks.
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