New boiler installation in Teesside
A new gas boiler installed on a Teesside home costs £1,900 to £3,600 in 2026, including the appliance, flue, magnetic filter, system flush, controls and commissioning. Sized on the house, not on guesswork.
Sizing beats brand every time
The most common fault in a new installation is not a faulty appliance, it is an appliance chosen for the wrong house. Oversizing has been the industry habit for twenty years: a 30kW combi dropped into a three-bed semi that needs 12kW of heat cycles on and off all winter, wears its components out early and quietly burns money. Correct sizing starts with a room-by-room heat loss estimate, the radiator count and the flow rate at the cold tap, then picks the output that matches. On a typical Teesside semi that lands lower than most homeowners expect.
What the installation actually involves
A first-fit day usually runs like this: isolate and drain, remove the old appliance, correct or renew the gas supply where the pipe run is undersized, form the flue through the wall or roof with the right clearances from windows and boundaries, run the condensate to an internal drain wherever possible, fit the boiler, add a magnetic filter on the return, flush the system, refill with inhibitor, fit and bind the controls, then commission with a flue gas analyser and record the gas rate. The benchmark book is filled in on the day, the Building Control notification goes in afterwards, and the certificate arrives by post.
Where the price moves
Four things move an installation price on Teesside homes. Position: moving a boiler from a bedroom cupboard to the kitchen adds a day of pipework. Gas supply: many older properties still run 15mm to the meter and need an upgrade to 22mm before a modern appliance will run at rate. Condensate: a boiler on an outside wall with no drain nearby needs a proper run rather than a frost-prone pipe down the render. And system condition: black, sludge-heavy water in a thirty-year-old system needs a power flush before a new heat exchanger goes anywhere near it.
Warranties are earned, not given
Manufacturer warranties on quality appliances now run seven to twelve years, but every one of them is conditional: registered installation by a Gas Safe engineer, a filter fitted, the system treated with inhibitor, and an annual service recorded on time. Miss a service and the cover lapses on the very component you were counting on. Any quote should tell you the warranty length and exactly what keeps it valid.