Description
Product details
Product information
The Ray Max GB 20kW Wood Burning Multi Fuel Stove with Back Boiler is a powerful, Eco Design compliant stove designed to provide room heating plus hot water/central heating from one appliance. Manufactured in Europe from 6mm rolled steel (not fragile cast iron), it offers strength, fast heat-up and long-lasting performance, finished in black with chrome silver handles and controls. With up to 21kW total output, it delivers up to 14kW to water and up to 7kW to space heating, making it ideal for heating radiators and domestic hot water while still warming the room. Based on an average 3000 BTU per radiator, the boiler can heat up to approx. 10–12 radiators (requirements vary). Control is simple with primary air plus twin secondary air controls. A large ceramic glass window with advanced airwash helps keep the flame view clearer, and a separate ash compartment with ash pan supports easier cleaning. Includes 1″ BSP flow and return connections. UK/CA marked, ISO 9001 manufactured, 2-year warranty. Specifications Max Output: 21kW Max Water Output: 14kW (48,000 BTU) – up to approx. 10–12 radiators Nominal Water Output: 7.5kW Max Space Output: 7kW | Nominal Space Output: 5.5kW Water Connections: 1″ BSP (flow + return) Dimensions: W668mm / D451mm / H800mm Firebox: W580mm / D370mm / H470mm (fully lined) Door Glass: 450mm x 220mm Weight: 125kg | Colour: Black Flue: 150mm top outlet (Euro adapter required) Efficiency: 80% Fuel: Wood & multi fuel Warranty: 2 years Key Features Eco Design compliant • Integrated back boiler • 6mm rolled steel body • Ceramic glass with airwash • Primary + twin secondary air controls • Multi-fuel grate • Large removable ash pan
- Guarantee – 2 years
Features and benefits
- Integrated back boiler: Heats radiators and/or domestic hot water as well as the room from one stove.
- High total output (up to 21kW): Powerful performance for larger heating demands.
- Balanced heat split: Up to 14kW to water and 7kW to space heating for efficient whole-home warmth.
- Eco Design compliant: Cleaner, more efficient burning with lower emissions.
- 6mm rolled steel construction: Strong, durable build with faster heat-up than many cast iron equivalents.
- Heats up to approx. 10–12 radiators: Based on an average 3000 BTU per radiator (requirements vary).
- Advanced combustion control: Primary air plus twin secondary air controls for better burn-rate and temperature management.
- Easy ownership features: Large ceramic glass with airwash for a clearer flame view, plus a separate ash compartment with removable ash pan for simpler cleaning.





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