Snowbird
LIFE MEMBER
Hi Paul, Sorry if am a bit late with this but when I had the RV, I fitted tropical fishtank heaters in the fresh and waste tanks. They did not draw much power and did the job a treat. I drilled a small hole in the top of the tanks then dropped the heater in and fed the wire through a rubber grommet with a blob of silicone on. Bobs your auntie :thumb: