i have a 500l van mounted system fitted with 40 inch ro and two 20 inch filters.
doeas anyone use the tubular green hosue heaters to stop system freezing in winter,if you do what size heaters is required and waht wattage.
many thanks
Is it mounted onto the frame of the tank across the top like most suppliers usually do?
If so why not just through a double bed duvet cover over the tank and r/o housing?
Then just use an electric heater with frost stat to prevent the van from freezing up. Most use an oil filled radiator. A tube heater is a tiny heat source. If you have the r/o and filters in an insulated box then the tube heater will be ok provided you fit a temperature controller. But if you were hoping it would keep the van from freezing, then, IMHO, I believe its far too small.
There was some one on here at one time who had a couple of tube heaters stuck in strategic points under his r/o, but I wouldn't take the chance. To replace a 4040 that's been destroyed by ice isn't cheap.
There was once an old Brodex tank for sale on Ebay that had a 4021 housing and prefilters mounted inside the tank. The water in the tank would be an aid to keep the r/o from freezing. Omnipole also used to do it and probably still do.