Vetus hot water boiler 20 l double-walled

Type WHD, double-walled boiler - Water heaters & boilers While conventional boilers use heating coils made from a simple bent pipe, VETUS uses a very efficient double-wall principle. With a ribbed tank for a larger heating surface. As a result, the Boiler with double wall principle heats the water considerably faster than Conventional appliances. Content Fresh water: 20 L. Content Cooling water: 4 L.