This is a direct replacement for the more expensive Honeywell V4043H. The motorised zone valve ZL-2129 has been designed to control the flow of water within copper pipe systems Although specifically designed for small bore central heating systems, the valve can be used in commercial and industrial applications. Specifications Power Supply: 230v AC 50Hz Switch Rating: 2.2A Power Con: 6w Timings: on: 12 sec under power off: 6 sec under spring return Ambient Temp: 50c max Flow Temp: 5c to 80c max Static Pres: 8.6 bar max. The range has been designed with the installer in mind, and all are a quick, easy and reliable replacement for the market leader. Our Kudos Trading 2 port motorised Zone Valves are a proven and reliable range, with quiet operation and minimum power usage. The spring return valves have been designed to be used in commercial, industrial and domestic central heating systems which, when correctly wired with an appropriate room thermostat, cylinder thermostat and programmer, will control the water flow from the boiler to hot water, and from the boiler to 'central heating'.