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air thermostat allow aluminium amateur anthracite appliances asbestos base Biltin blowlamp boiler brick brickwork burner burning cable cent chimney coat coke cold air combustion concrete convectors cost crack dampers door draught Duncan Tucker Dutch-light electrical erected fan heater fire fixed flue pipe frame frost fuel oil galvanised garden glass green Greenhouse Heater greenhouse owner ground level heat losses heating apparatus HUMEX humidity Igatpuri immersion heater inside the greenhouse installed insulating lean-to length less light maintain makers manufacturers material metal greenhouses method moisture necessary OAKWORTH obtain oil heater operation ordinary Padiham paint panels panes paraffin plant house plastic PLATE putty radiation roof roofing felt seed seedlings sheet side sill small greenhouse smoke pipe soil solid fuel solid fuel boiler staging structure supply surface temperature thermometer Thermoplus timber unheated usually ventilators walls water thermostat weather winter wire wood wooden