Combi boiler installationin Milton Keynes

Turn a hot tap and the boiler fires, heating the water as it passes through. Nothing is stored, so there is no airing cupboard full of cylinder and no pair of tanks sitting in the roof. You get the space back and there is nothing waiting to overflow.

That fits a lot of Milton Keynes housing stock. A two or three bedroom estate house, one bathroom, one or two people in most of the time, and a decent cold main coming in. If that describes your home, a combi is normally the simplest boiler to own and the cheapest to fit.

It is the wrong answer for some houses, and a decent engineer will tell you so rather than sell you one anyway. Because a combi makes hot water as it flows, it really only does one thing at a time. Run two showers together, or fill a bath while someone washes up, and both go weak. If your household uses two bathrooms at once on a normal weekday morning, a system boiler with a cylinder will serve you better.

The other thing that rules a combi out is the water coming into the house. Poor mains pressure or a thin trickle of flow, often down to a long or narrow supply pipe, and a combi will let you down from day one. A higher output will not rescue it. This is why the installer tests before recommending anything.

1. Dust sheets down, gas and water isolated, and the old system drained.
2. Old boiler off the wall and out. On a conversion, the cylinder and loft tanks come out too.
3. Gas, water and condensate pipework altered to suit the new unit, including any gas supply upgrade.
4. New boiler hung, flue fitted and sealed, condensate routed to a drain and insulated if it runs outside.
5. System flushed, inhibitor added and a magnetic filter fitted so the new heat exchanger is not running on sludge.
6. Controls fitted and paired, then the boiler fired up and commissioned to the manufacturer's instructions.
7. Benchmark checklist completed, the work notified through Gas Safe, and your warranty registered.
8. A proper handover: how the controls work, where the filling loop is, and what to do if the pressure drops.

A like for like swap normally finishes the same day. Allow a second day for a conversion, since there is a good deal more to strip out and rework before anything new goes on the wall.

The gap between the two rows is the stripping out and the reworking, not the boiler. Where your job lands inside either range depends on the model you pick, the flue run, and whether the gas supply needs upgrading. The full breakdown sits on thenew boiler cost page, and if you are weighing up whether to replace at all, start with boiler replacement.

We are a referral service, not an installer. The price you pay is agreed between you and the independent Gas Safe registered installer who surveys your home.