Hey, this is fun!
My last post on this thread, as it seems that you will never satisfy everybody, so why bother...
No, a dripping relief valve isn't a major issue, except that on my boat I hate it when the bilge pump
comes on at night, and I will get up and check just to make sure...
Yes, you can route
from the relief valve into the bilge
, since the worst that can happen is that your bilge pump
is stuck, and then you would simply transfer the weight from the water
tank to the bilge
I would never route
relief valve water back into the main tank - first, you simply should NOT restrict the flow of water out of the safety
valve, and a hose back to the tank could get crimped or worse, and second, I see enough issues with keeping my fresh water fresh, and the warmer the faster stuff grows. Once it's in the hot water tank, it will go out via the shower
pump or into a kettle (and thereafter...I'll leave that to your imagination).
In short, if you want to do it proper in my book, you put in an expansion tank, if you feel that that's a restriction of your personal freedom, you can leave it out - just as long as you are enjoying your boat...