A separate heater switch would be nice, as I use my CPP2 quite often for my B&W developing when I don't need any temperature control (faucet gives me 20˚C most times of the year). Currently I just change all the temp dials to the lowest setting, which usually keeps the heater off, but that means I need to reset it back to the 37.4˚ or so that I use for my color dev every time