Riello RDB burners are distinguished by their small size in relation to their powerful output, which means they can be fitted to almost any boiler on the market, indoor or outdoor (286mm wide, 202mm deep, and 230mm high). Use the 'Have a question' feature or email us with the details of your boiler if you are unsure that this burner will fit (there are very few boilers that it will not fit!). At the price shown we can supply a Riello kerosene burner to fit a domestic boiler with up to 35kW of output - usually more than enough output for up to 16 radiators (so, by far the majority of UK homes would not require anything bigger). Choose from (a) 15-21kW (50k -70k BTU) (b) 21-26kW (70k-90k BTU) or (c) 26-35kW (90k - 120k BTU). When you buy, just message us to let us know which version you require. The burner comes with an instruction manual, flange, gasket, and braided flexible hose. Riello kerosene burners are the no. 1 choice in the UK and are used in the majority of Worcester Bosch, Grant, Firebird and Warmflow boilers in the 21kW to 33kW range. Also used in MANY other types of oil-fired burners. 12 month warranty. In developing these burners, special attention was paid to reducing noise and to the ease of installation and adjustment. Riello have over 80 years of experience in design and manufacture. All the models are approved by the EN 267 European Standard. The burner comes with an instruction manual, flange, gasket, and braided flexible hose. We also do a diesel version (diesel burners should only be used in outdoor boilers with a conventional vertical flue (not a low-level flue). All the RDB burners are fired before leaving the factory. Any doubts please contact us using the 'have a question' function or email and we'll reply in no time at all!