It appears that our water heater has bit the dust (rusted out) and we want to replace it. As it turns out, it looks like the heater was installed before the deck was installed (no aperture will accept its dimensions). So we think we're going to have to cut in half horizontally (w/ the attendant mess). Tumblewood is an '81 model and the heater is cylindrical and looks like an RV model. Anyone have any experience even if only closely related? All replies gratefully received! Larry Colter