Heatrae Sadia Multipoint Eco Vertical 50 Litre 3kW Unvented Water Heater 7693981 Heatrae Sadia Multipoint Eco 50L 3kW heater 7693981. This 50 litre model is ideal for a single heater where multiple outlets are required. This product is quick and simple to install. It is supplied with a factory fitted temperature and pressure relief valve. It is also available in many other capacities. The dimensions are 1007 x 371 x 350. The ERP rating of this heater is B which makes it a very efficient heater. This is available a horizontal model as well which makes this heater suitable for all applications. It is supplied with all safety valves and an expansion vessel to go with it.