Heatrae Sadia FBM 120 ECO 3kW Cistern Type Water Heater

The Heatrae Sadia FBM 120 ECO 3kW is a cistern-type vented electric water heater with a 120 litre capacity, designed for commercial and domestic applications where a gravity-fed hot water supply is needed without mains pressure. Being fully vented, it requires no pressure relief valve or external venting — simplifying installation and long-term compliance. With an integral cold water cistern built into the unit, the FBM 120 ECO replaces the need for a separate loft tank, and includes Heatrae Sadia's intelligent Legionella Control System and fault-reporting electronics for improved commercial hygiene management. 120L Capacity 3.0kW Heating Element 135 min Heat-Up Time 10 minutes at 12L/min Fill Rate C ErP Class 5 Yr Warranty Integral Cistern Design The FBM 120 ECO incorporates its own cold water storage cistern, removing the need for a separate loft tank and simplifying installation in properties without existing hot water storage. No External Vent or PRV Needed As a vented water heater, it doesn't require a pressure relief valve or external tundish/discharge pipework — reducing installation complexity versus unvented alternatives. Intelligent Legionella Control Built-in Legionella Control System helps protect against harmful waterborne bacteria in commercial and multi-occupancy settings. Automatic Fault Reporting Electronic diagnostics provide automatic fault reporting, helping facilities teams identify issues quickly rather than relying on manual inspection. 10 minutes at 12L/min Fill Rate Rated fill flow of 10 minutes at 12L/min gives a clear benchmark for expected refill performance after draw-off. ErP Compliant Design Meets current Eco-Design and Energy Labelling Directives for water heaters, rated Class C for water heating energy efficiency. Performance Capacity 120 litres Heating Element 2.8kW @ 230V / 3.0kW @ 240V Heat-Up Time 135 minutes Fill Rate 10 minutes at 12L/min Efficiency (ErP) Load Profile M Water Heating Energy Efficiency Class C Water Heating Energy Efficiency 36.6% Annual Electricity Consumption 1,403 kWh Daily Fuel Consumption (Q elec) 6.55 kWh Heat Loss 1.27 kWh/24h Pressure & Water Supply Maximum Inlet Pressure 1 MPa (10 bar / 145 psi) Minimum Dynamic Supply Pressure 0.5 bar Type Direct, cistern-fed (vented) Construction & Physical Weight (Empty) 40kg Weight (Full) 160kg Dimensions (H x W x D) 1020 x 660 x 430mm Compliance Product Code 95040303 Approvals Kiwa approved (Water & Building Regulations), Nemko approved (electrical safety), CE marked Warranty 5 years Does the FBM 120 ECO need a separate cold water tank? No — it has an integral cistern built in, so a separate loft tank isn't required. Does it need a pressure relief valve? No. As a vented water heater it does not require a pressure relief valve or external tundish, unlike unvented alternatives. How long does the FBM 120 ECO take to heat up? The manufacturer's rated heat-up time is 135 minutes from cold. What's the difference between FBM ECO and R Plus? Both are vented cistern-type heaters from Heatrae Sadia sharing similar footprints, but FBM ECO offers a higher ErP efficiency class and a 5-year warranty, while R Plus is a more budget-focused option with a 2-year warranty and simpler fault reporting via a flashing LED. Is the Legionella Control System automatic? Yes, it operates automatically as part of the unit's built-in electronics, requiring no manual intervention from the user.