1.1 This specification contains specifications for the dimensioning of custom tiled/mortared masonry heaters (stoves). The custom tiled/mortared masonry heaters (stoves) are individually technically calculated and constructed. This information can be used for log (cordwood) wood-fired masonry heaters that burn one fuel load per storage period with a maximum load between 10 kg and 40 kg and a storage period (nominal heating time) between 8 h and 24 h in accordance with EN 15544.

1.2 This specification is valid for masonry heaters equipped with fireclay as interior material with an apparent density between 1750 kg/m³ and 2200 kg/m³, a degree of porosity 18 up to 33 % by volume, and a heat conductivity from 0.65 W/mK up to 0.90 W/mK (temperature range 20 °C to 400 °C) in accordance with EN 15544.

1.3 This specification is valid for masonry heaters with sidewise combustion air supply of the combustion chamber.

1.4 This specification is not valid for masonry heaters combined with water heat exchangers for central heating or other heat-absorbing elements such as glass plates greater than ¹/₆ of the combustion chamber surface, open water tanks, and so forth. It is also not valid for masonry heaters combined with heating/fireplace elements in accordance with EN 13229. Furthermore, this specification is not valid for mass-produced prefabricated or partly prefabricated slow heat release appliances in accordance with EN 15250.

1.5 The calculation method of this specification is used to establish emissions and energy efficiency when burning log wood or wood briquettes in accordance with the manufacturer’s or builder’s manual.

1.6 Clearance to Combustibles—When a masonry heater is constructed in accordance with this specification, the clearance to combustibles shall be in accordance with TRVB 105 or other appropriate standards.

1.7 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.