Help-link care is our range of maintenance and service plans, which provide you with peace of mind that your heating system will be looked after when you need it most. Sealed-system boilers work well in most. Find out how much it will cost for you to connect your home to the natural gas network. Average cost of heating engineering jobs in the uk. If drainage condition is a concern then you may wish to consider a drainage condition survey (cctv) as this would give you the network.