Boiler Plus explained: why every new boiler needs a programmable thermostat

The government rule behind why every new combi boiler comes with proper heating controls, explained in plain English.

4.9 from 65 Google reviews
Vaillant boiler with wireless heating controls
Our work
Fully insured
12-month workmanship guarantee
Price match guarantee4.9 from 65 Google reviews

If you've noticed every boiler quote you get includes "programmable heating controls", it's not upselling, it's the law. Boiler Plus is a set of Building Regulations that's applied to combi boiler replacements in England since April 2018, and it's worth understanding what it actually requires.

What Boiler Plus requires

Every new combi boiler installed in an existing home in England must meet a minimum efficiency of 92%, and the installer must also fit at least one of these additional measures:

  • A flue gas heat recovery system
  • Weather compensation, adjusting output based on the outside temperature
  • Load compensation, adjusting output based on how close the room is to its target temperature
  • A smart thermostat with automation and optimisation features
1

Flue gas heat recovery

Recovers extra heat from the flue gases before they're lost, boosting efficiency.

2

Weather compensation

Adjusts the boiler's output automatically based on the outside temperature.

3

Load compensation

Adjusts output based on how close the room is to its target temperature.

4

Smart thermostat

Automation and optimisation features. The option most installers, us included, fit.

Most common
Every new combi install needsA minimum 92% ErP efficiency rating, plus one of the four measures alongside.
We fit option 4 as standardEvery boiler we install includes programmable heating controls that satisfy this, at no extra cost.
Boiler Plus (Part L Building Regulations), England, since April 2018.

Most installers, us included, satisfy this through the fourth option, since it's the most practical for the widest range of homes and gives you a genuinely useful upgrade rather than a box-ticking exercise.

What this means for your installation

Every boiler we fit, on every package, includes programmable heating controls that meet the Boiler Plus requirement as standard, so this isn't something you need to think about or pay extra for. If you'd like to go further with a full smart thermostat, connected to an app on your phone, that's an optional add-on in our instant quote tool. See our guide on smart thermostats and OpenTherm for what the upgrade actually gets you.

Does this apply to you?

Boiler Plus applies to combi boiler installations in existing homes in England. It doesn't apply in Scotland, Wales or Northern Ireland, which have their own building standards, and new-build homes are covered separately under different regulations. If you're not sure whether it applies to your job, we'll confirm it as part of your fixed quote. Get your instant boiler quote.

More guides

Keep reading

Boiler being tested with a flue gas analyserGuide

Landlord safety certificates explained

Gas safety records, EICRs and alarms: what the law requires, how often, and the deadlines that catch landlords out.

Read the guide
Worcester Bosch boiler neatly fitted between kitchen cupboardsGuide

How to choose the right boiler

The differences between boiler types, how to pick the right one for your home, and what a proper installation includes.

Read the guide

EICR codes explained

What each observation code on an EICR means, what makes a report unsatisfactory, and what to do about it.

Read the guide
Combi boiler fitted neatly into a kitchen alcoveGuide

Best combi boilers for London homes

Which combi boiler suits your home, by property size and budget, and what's actually worth paying more for.

Read the guide
Worcester Bosch boiler with neat copper pipework in a hallwayGuide

Comparing boiler brands: why we fit ATAG

Why ATAG is our Standard and Premium boiler of choice, and how it compares to the brands you've actually heard of.

Read the guide
Modern boiler with a neat pipework cover, ready for a system cleanGuide

Power flush vs MagnaCleanse: do you need one?

What a power flush, a MagnaCleanse and a standard clean actually do, and which one your system needs before a new boiler goes in.

Read the guide
Vaillant boiler with new pipework and magnetic filterGuide

Magnetic filters vs scale reducers explained

Two small devices that quietly protect a new boiler for years — what each one does and why London's hard water makes both worth having.

Read the guide
Vaillant boiler fitted in a kitchen cupboard, paired with smart controlsGuide

Smart thermostats and OpenTherm explained

The difference between a basic thermostat and an OpenTherm smart thermostat, and whether the upgrade is worth paying for.

Read the guide

PAT testing explained

What PAT testing actually checks, who's responsible for it, how often it's really needed, and roughly what it costs.

Read the guide

Get a fixed price for your job.

Free, no-obligation quotes from a qualified local engineer.

Registered, certified and insured

Gas Safe registeredReg. no. 928769NICEIC Approved ContractorEnrolment no. 620104F-Gas certifiedCert. no. 3018717
Fully insuredPublic liability cover
Price match guaranteeFound it cheaper? We'll match it
Call WhatsApp Price
WhatsApp us