the worker has finished servicing the boiler and tightens the last nuts.close up

adult boiler buildingservices calorificvalue energy firedboiler fix floor gas gasboilder handyman heater heating heatingengineering heatingplant heatingsystem heatingvalue holding home house installation installing insulation job leaky maintenance man modern new newbuilding newconstruction person pipe plumber plumbing repair repairman sanitary screwdriver service skill system technician thermal tool utility valve warmwater water worker