They work great when they work. Mine is a different company but I think the same principle. They are set up the same as a furnace with spray nozzle and electrodes. I will say this... they are much quieter than a torpedo heater. And put out a radiant heat but always needs work and I even had to take it to a local shop and when it came back it was no different. Tried to send it back but waited too long. Just my opinion.