I used to do my own b/w processing and printing a while back, and I'm now looking to get back into this. I'm considering the Nova 150W 'Novatronic' combined water heater and thermostat to control a water bath temp. for film processing as I can't afford the cost of a film processor. Has anyone used this or similar products? Does it keep the bath at a stable temp. like it claims? Cheers, Richard.