- Mar 5, 2014
I am adding a whole house water filter, which is comprised of 3 4.5x20 cartridge filter housings assorted valves and a backflow preventer. Even though it doesn't get very cold here in Texas, I will need some kind of heater. I used to have a boat that had a bilge heater but marine equipment is very expensive. I need to heat the entire enclosure which is about 16x36x40 inches and will be well insulated. We get occasionally get temperatures down to 20F in the winter.