> Firstly was the design of a water filled heater box. I am going to > buy one bare J-tube (cost about 7 quid) this weekend. Basically it's > a heater box exhaust tube - without the heater box shroud and fins. > I am going to weld a water tight tube around this J-tube as below: > > J tube \ ___ > / water tight tube > out__|_____________ / > \_|__________|___ > |__________|_ > in > This sounds like a pretty good idea to me! My concerns would be: 1) the system must have an expansion tank since it's a closed loop, and 2) there must be some sort of relief valve (like on any heating vessel) in case your water pump fails or your expansion tank isn't big enough. I think that you did mention some sort of tank to let off steam. If that includes a relief valve, you'll be in good shape. Later. . . . .Brad ------------+----------------------------+------------------------------------- Brad Snyder | Lehigh U.: bls3@Lehigh.EDU | BBS, the First Floor: (610) 760-0527 ------------+----------------------------+-------------------------------------
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