Burners and boilers, see 27.060
Central heating systems, see 91.140.10
ICS Field
97.100.01 Heating appliances in general
97.100.10 Electric heaters
97.100.20 Gas heaters
97.100.30 Solid fuel heaters
97.100.40 Liquid fuel heaters
97.100.99 Heaters using other sources of energy
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  6. 97.100 - Domestic, commercial and industrial …