The standard specifies requirements and test methods for special gas boilers.
DIN 4702-3:1990 history
2007DIN EN 13836:2007 Gas-fired central heating boilers - Type B boilers of nominal heat input exceeding 300 kW, but not exceeding 1000 kW; English version of DIN EN 13836:2007-06
1990DIN 4702-3:1990 Central heating boilers; special gas boilers with atmospheric burners