#3461 HEAVY DUTY PLASTIC HEATER 7 1/2Polmark
Works like a champ even at 8 deg. Never have a frozen waterer.
i sell 2 types of drinker i also sell feed and many accesories very popular in quebec and ontario with over 700 homer racers
Works great and easily sanitized. Plugged it into a thermo cube and now, no more frozen water during cold Michigan winters.
Bought this for my birds' first winter in their loft for my 1/2 gal drinker. Will probably have to get a new one this coming winter for my new larger waterer - but this definitely did the job. No ice in the water, keeping it nice and drinkable for the pidges. Seems to be quite sturdy to my untrained eye, too.