Replacing the original boiler in a Bradley Stoke home

Bradley Stoke is young by Bristol standards. According to Wikipedia, it was planned in the late 1970s, building work began in 1987, and it was Europe’s largest new town built with private investment. That means its homes are now somewhere between their second and fourth decade, and many are on their second or third boiler.

This guide looks at what we find in Bradley Stoke homes when a boiler needs replacing, and the choices worth thinking about.

What Bradley Stoke homes usually have

Homes across Bradley Stoke were built by several developers over many years, so layouts vary. Common set ups include:

Era	Typical original system	What we often find now
Late 1980s	Regular boiler, vented cylinder, loft tanks	Original boiler replaced once, tanks still in the loft
1990s	Regular or system boiler with cylinder in the airing cupboard	Some swapped to combis, some still on cylinders
2000s	System boiler with unvented cylinder, or combi in smaller homes	First replacement now due

These are general patterns, not rules. Every house gets surveyed.

Things to check before replacing

The cylinder

If you have a cylinder, the first question is whether to keep it. A cylinder from the 1990s may have thin insulation compared with modern ones, and its immersion element may be scaled up. In Bristol’s hard water, scale builds on elements and coils over time. Bristol Water says all its supply is moderately hard to very hard.

Options are to keep the cylinder, replace it like for like, upgrade to an unvented cylinder, or remove it and fit a combi. Our hot water cylinders page explains these, and our guide on combi vs system boilers helps decide.

Mains flow and pressure

Homes built from the late 1980s are unlikely to have lead supply pipes, which Bristol Water links mainly to homes built before the 1970s. But flow still varies with the size of the supply pipe and where it runs. A flow test tells us whether a combi or unvented cylinder will perform well.

Flue position

Many original boilers sit on an outside kitchen wall with a flue straight through. Rules on flue positions have changed over the years. Some older positions, such as directly under a window that opens or very close to a neighbour’s boundary, may need changing or a plume kit. The boiler maker’s instructions set the rules, and a Gas Safe registered engineer must follow them.

Pipework

Some homes from this era have plastic push fit heating pipes, some have copper, and many have both after earlier work. Push fit joints are reliable when fitted well, but older ones can weep, especially where pipes were not supported or were disturbed during later work. A boiler swap is a good time to look at the joints near the boiler and in the airing cupboard.

Condensate route

If the original was a non condensing boiler, the new one will need a condensate drain. In many Bradley Stoke kitchens this can run into the sink waste. Where it has to go outside, it should be sized and insulated so it does not freeze. See our guide on frozen condensate pipes.

Scale protection

Building guidance asks for scale treatment on combi boiler and water heater feeds where hardness is above 200 ppm. This is set out in the government’s Domestic Building Services Compliance Guide. Most new boiler installs in the Bristol Water area should include a scale reducer.

What the install involves

1. Survey. We look at the boiler, cylinder, flue, gas supply, mains flow and pipework.
2. Quote. You get a written quote with the boiler type and what is included.
3. System clean. The heating is cleaned before the new boiler goes on.
4. Fit. The old boiler comes out, the new one goes in, with a filter and scale protection.
5. Commissioning. The boiler is tested and set up, controls are set, and you are shown how to use it.
6. Paperwork. The Gas Safe registered engineer notifies the work, and you receive a Building Regulations compliance certificate and the warranty registration.

Who does the work

Fitting a gas boiler must be done by a Gas Safe registered engineer. Ask to see their Gas Safe ID card and check it on the Gas Safe Register. The card lists the types of gas work they can do. Bradley Stoke sits in South Gloucestershire, so South Gloucestershire Council is the local building control body, but gas boiler installs are normally notified through the Gas Safe scheme rather than directly.

What affects the price

We do not publish prices. A new boiler quote in Bradley Stoke depends on:

• The boiler type and output
• Keeping, replacing or removing the cylinder
• Removing loft tanks and capping old pipes
• Moving the boiler or changing the flue
• Condensate drain route
• Gas pipe size, which may need upgrading for a combi
• System clean, filter and scale reducer
• Controls, such as a smart thermostat

Your price is confirmed after a survey. Our new boiler page explains how to get a quote.

The short version

Most Bradley Stoke homes are now on their second or third boiler. Before replacing yours, decide whether to keep the cylinder, test the mains flow, check the flue position and joints, and make sure scale protection is part of the install.