This year I'm building a small/miniature pump house to house a sap tank and a sap guzzler. I'm looking for a small heater to go in with the guzzler to prevent it from freezing. I'm only seeing 200 or 300 watt heaters and I know that is too much. I had a 300 watt heater in one of my RV bays doing some late fall camping and it was over 90 in there with a 300 watt heater. Way too hot for what I want. I also saw 100 watt "reptile" heat lamps that do not emit light but I thought I would see what other people use.