Forced air furnace heating black/gray holding tanks?
After removing the rear bathroom and floor of my 75 argosy 26' TT i found both the black/gray holding tanks. what i found odd at first was a small heat tube was running to each tank from the main forced air furnace vent. the tube looks like it supplied the hot furnace air into the box or area surrounding the tanks. i now know this was most likely meant to prevent freezing of the tanks in cold weather. i have eliminated the forced air furnace, replacing it with an electric heater and possibly radiant floor heating.
If the supply of warm air to the area surrounding the tanks is vital then i need a solution. i don't plain on being in such freezing condition for only a small part of the year if even, but i also would not want the trailer to fail if put in that condition.
My first thoughts were using the original furnace air vent as a new return. with a small electric motor to draw warm air from inside the trailer into the small tubs and to the tank areas as before. or perhaps someone can offer advice on a heating blanket or device for the tanks?
Two people, Three cats, and a Travel trailer!!