Profile: Honeywell Control Systems. is a supplier of domestic heating and combustion control products. Our product line includes radiator thermostats, programmable thermostats, time & temperature controls, valves & spare parts. Our VT15 radiator thermostat features a bi-directional valve body and integral balancing adjustment. The sensor head may be mounted vertically or horizontally by interchanging radiator tail and copper tube fittings. Our M30 range of programmable thermostats is designed to provide automatic time and temperature control of heating systems in the home. CM31 is a simple to use battery powered analogue programmable thermostat with electronic temperature control and 1 day programming capability.