BS 8511:2010 pdf download – Code of practice for the installation of solid fuel heating and cooking appliances in small craft
4 Appliance selection
4.1 Design and suitability Consideration should be given to the size and construction of the space into which the appliance is to be installed, the appliance’s claimed heat output, and the appliance’s required frequency of attention. Manufacturer’s leaflets and technical specifications should be consulted to verify the necessary information. The selected appliance should be of a freestanding type only and be suitable in respect of design, construction, installation and safety for use on boats in accordance with manufacturer’s instructions for installation on boats or with this code of practice.
NOTE 1 Appliances that conform to the construction and performance requirements ofBS EN 13240 or BS EN 12815 would be suitable in respect ofdesign, construction, installation and safety for use on boats.
The appliance should be fitted or provided with means by which it can be securely fixed to the hearth or the structure of the craft when in its final position (see also Clause 6 for further detail on hearths). The appliance should be fitted with doors that can be securely fastened in their closed position but are capable of being opened to at least 90° for tending the fire. The selected appliance should be fitted with a socket capable of allowing a suitably gas tight connection to be made between the appliance and the connecting flue pipe or suitable adaptor.
NOTE 2 A top flue outlet connection is preferable, for optimal flow of flue gases and ease ofinstallation, and to make cleaning ofthe flue easier. Suitable operating tools should be provided with the appliance, especially for operation and manipulation of hot components, e.g. de-ashing, refuelling. A suitable heat protective glove is considered a tool. Consideration should be given to the internal flue diameter when selecting the appliance relevant to the intended fuel type use, as recommended in 8.2.
4.2 Heat output and efficiency It is not easy to ensure the distribution of heat in narrow or long spaces, and the shape of the space to be heated and the positioning of the heating appliance should be carefully considered before deciding to use a single appliance, even if apparently of large enough heat output. In initial selection of an appliance an allowance of not less than the following should be taken:
a) for spaces up to about 28 m 3 capacity, use 0.10 kW/m 3 ;
b) for spaces from 28 m 3 up to about 57 m 3 capacity, use 0.09 kW/m 3 ;
c) for spaces from 57 m 3 up to about 85 m 3 capacity, use 0.08 kW/m 3 . NOTE 1 For a 14 m (45 ft) narrowboat cabin the calculation would be as follows: Occupied volume = 2 × 2 × 13 metres = 52 m 3 . Therefore, based on a factor of0.09 kW/m 3 , the required heat output would be 4.7 kW.
NOTE 2 The precise value varies not onlywith capacity, but also according to the insulation and exposure ofthe craft and the temperature requirements. Ifthe appliance is installed into a smallerspace than the largest it can serve, it will, ofcourse, burn less fuel and require less frequent refuelling. Howeverit is important not to select an appliance with an output which is grosslytoo large orgrosslytoo small forthe space which it has to heat. The heat output and efficiency of an appliance will depend upon the conditions under which it is used, and it should be noted that steady burning and avoidance of over-firing will provide the best service and reliability. For appliances with a firebox volume greater than 0.01 m 3 and grate area greater than 0.05 m 2 , in order to be energy efficient and reduce CO 2 emissions, the selected appliance should meet the minimum gross efficiency of 65% for stoves and 60% for cookers when tested to BS EN 13240 or BS EN 12815 respectively.
NOTE 3 A list ofappliances meeting these minimum recommended efficiencies is published by HETAS Ltd and is available for viewing on their web site at www.hetas.co.uk.