||10-30-2012 08:01 AM
Two plumbing questions: Water heater drain and expansion tank.
I have a couple questions about water heaters.
The first one is a purely practical question. I need to replace my 11 year old electric water heater and the builder-installed one was installed in an internal closet directly on hardwood floors with no drain pan.
A recent leak in my garage installed second water heater has spooked me and I want to install a drain pan. The problem is there really is no practical way of getting a drain pipe to the outside. There is a relatively straightforward run through drywall to a shower cubicle in my second bathroom.
Would it be acceptable to run PVC from the drain pan to a (say) chrome short pipe just protruding through the cultured marble of the shower cubicle?
I'm pretty sure I can make the outlet look presentable enough; any thoughts?
The second question is less practical, more theoretical. I understand the function of the expansion tank near the water heater: Basically, when there is a check valve or PRV in your cold incoming supply the system is closed in that expansion in the heating water in the tank has nowhere to go. But surely in most systems (as in my house) even just one toilet cistern would satisfy this need since the cold water supply can now expand into the air space in the cistern. What am I missing?