Unvented Hot water cylinder, repair or service This is for an appointment for the inspection of a unvented hot water cylinder usually taking between 1hr - 1.5hrs. If any parts are required this will be charged accordingly at parts plus labor, unless you have a current manufactures warranty on the appliance. This will be agreed before undertaking any further works. Please Note. We are Gas Safe Registered and carry our ID Cards. We are accredited with all the leading manufactures. We attended their regular in house training and have regular update's from them. This applies if you have a current manufactures warranty on your appliance.