How long does a replacement take?

A like-for-like combi replacement is usually done in one day. A conversion, a boiler move or a difficult flue can take two to three days. We confirm the realistic timetable in writing.

Do I need to drain the whole system?

The system is drained and refilled as part of the installation. We flush and add inhibitor, and we check for leaks and air before handing over.

Can I keep my existing radiators and controls?

Usually, yes, if they are in good condition and compatible. We check them during the survey. Old or unbalanced radiators can undermine a new boiler's performance, so we will tell you if they need attention.

Can you replace a boiler at short notice?

Sometimes. If the boiler is beyond repair and we have capacity, we will fit you in as soon as we can. Call us and we will give you an honest timescale rather than promise a slot we cannot keep.

Will the new boiler fit the existing flue?

Not always. Flue standards and boiler positions change, and a new boiler may need a new flue route. We check this before quoting and include any new flue in the written price.

Boiler replacement · SD Plumbing & Heating

Replace the boiler.
Not the whole house.

A straightforward Worcester Bosch replacement from SD Plumbing & Heating, fitted in a day where possible. We reuse what is safe and sensible, replace what is not, and put the scope in writing before we start.

Get a fixed quote 0131 392 8722

Every replacement

Fixed price,
in writing.

0% finance available · subject to status

Boiler, filter and standard flue
Old boiler removed and recycled
Gas Safe commissioning
Guarantee registered before we leave

Get a fixed quote

Replacement or new install?

Same pipework.
Better boiler.

A replacement swaps an existing boiler for a new one, usually in the same position. A new installation is for a property that has no boiler or needs a completely new heating system.

Replacement

Existing boiler and flue position
Usually one day
Lower cost, less disruption
Ideal when the system is otherwise sound

New installation

No existing boiler, or a full system change
Two days or more
New pipework, flue and controls
Common in renovations and conversions

Time to replace?

Seven signs the
boiler is done.

Not every fault means a new boiler. But when these stack up, a planned replacement is usually cheaper and calmer than a breakdown in winter.

Repeated breakdowns

Two or three call-outs a year, especially for the same fault.

Unreliable hot water

Temperature swings, slow hot water or cold when another tap runs.

Age and parts

12–15 years old, with parts becoming hard to source.

Rising bills

Efficiency losses, poor controls or a system that no longer suits the home.

Uneven radiators

Cold spots and slow heat can point to sludge or a failing system.

Yellow flames or soot

A safety issue. Turn it off and call the Gas Emergency Service on 0800 111 999.

Renovation plans

A new kitchen, extension or loft conversion changes the right boiler and flue route.

What's included

The full scope,
written down.

A replacement should leave you with a safe, clean, efficient system — not just a new box on the wall.

New Worcester Bosch boiler
Greenstar system filter
Standard flue (up to 1m)
Gas Safe installation & commissioning
Old boiler disconnected and removed
System flush and inhibitor
Building Regulations notification
Manufacturer guarantee registration
Digital handover pack
One-hour arrival window

Replacement timeline

Morning

Arrival, protection, isolation and old boiler removal.

Midday

New boiler mounted, flue fitted and pipework connected.

Afternoon

Flush, inhibitor, commissioning and radiator balancing.

Handover

Controls explained, guarantee registered, old unit removed.

A conversion or difficult flue can extend into a second day. We tell you before booking, not on the morning.

Questions

Replacement questions.

The things Edinburgh homeowners ask before replacing a boiler.

It depends on the boiler, the flue route and the access. We do not publish prices online: after photos or a short survey we send a fixed written price that itemises the boiler, the flue and any access work, so nothing changes after you accept.

Ready when you are

A fixed price, in writing.

Tell us about the home and the flue. We come back with a fixed written price — nothing published online, nothing changing later.