DESIGNA HANDYMAN 3KW OVER SINK WATER HEATER UNIT Simple Single on/off & temperature control Used with swivel arm & spout provided Thermal limiter set at 55°C +/- 3°C 15mm pipe connection 3k W Available for upto Next Day Delivery. Buy Online Today! The " Handyman" hand wash oversink water heater unit is a quick & effective way to provide a simple handwash facility. This over sink water heater operates off the cold mains water supply & heats water as it is used, making it an ideal & economical solution for most hand wash requirements, especially if the product is in an isolated location away from hot water supply, or if it is to be used only infrequently, as no power is wasted heating water when it is not in use. Single on/off & temperature control. 200mm long swivel arm to direct the water flow.