Accumulator tank with water heat. NIBE VPB, one of our new generation of water heaters, is suitable for connection to both heat pumps and gas/oil boilers. This free-standing water heater comes with copper, enamel or stainless steel corrosion protection (NIBE VPBS 300 only copper and enamel) and a capacity of 200 or 300 litres. It can provide all the hot water you need, or boost the capacity of an existing system. Insulated with neopor, it offers excellent thermal insulation.