OK,
Insite, I'm still confused...Suppose I'm a cockroach crawling around inside that chamber we're talkin about, all warm and fuzzy about my choice of hangouts---after all, I'm kind of hidden but I've got escape routes through
A,
B,
C and/or
D. Now---you said I should bolt on the thermostat housing with the t'stat included, AND also block off both
C &
D. With the thermostat cold (ie closed), I, the cockroach, am not going to be able to crawl out through
A, and additionally
C/
D have also both been blocked. That leaves
B as the only way out, and that's where you want me to put the hose (actually
1, but that goes only one place: down through
B). Once that's done, and the water turned on, there's no escape for either me or the water---it's a locked box with no exits. What am I missing?