What is Rare Plumbing Website?

A bespoke digital atelier providing precision engineering and climate control services for London's most discerning luxury estates.

What does a heating engineer do?

A heating engineer designs, installs, diagnoses and repairs heating systems — including boilers, radiators, underfloor heating, pipework, pumps, controls and BMS interfaces. RARE's heating engineers cover the full spectrum, from emergency boiler repairs to complex multi-zone system design.

What is weather compensation and why does it matter?

Weather compensation modulates boiler output based on the outdoor temperature — delivering exactly the heat required for ambient conditions. This improves comfort, reduces fuel consumption and extends heat exchanger life.

What is hydraulic separation and do I need it?

Hydraulic separation uses a low-loss header or buffer vessel to separate the primary boiler circuit from the secondary distribution circuits. It is necessary in systems with multiple circuits — underfloor heating, radiators and hot water.

How do you size a boiler correctly?

Boiler sizing requires a room-by-room heat loss calculation based on floor area, ceiling height, insulation values, window area and glazing type. A correctly sized boiler is typically smaller than most installers recommend.

Why do oversized boilers cause problems?

An oversized boiler reaches its set temperature quickly and shuts off — short cycling. This prevents the boiler from reaching condensing mode, wastes fuel and shortens boiler life significantly.

Do you install smart heating controls?

Yes. We install Heatmiser NeoHub systems for multi-zone UFH and radiator control, Honeywell evohome and Tado. We configure everything and set up the smartphone app before we leave.

What areas do you cover?

We cover all of Central and North London — Mayfair, Knightsbridge, Belgravia, Chelsea, Kensington, Marylebone, St John's Wood, Hampstead, Notting Hill, Primrose Hill, Belsize Park, Holland Park, Westminster, Pimlico and surrounding areas.

020 7458 4949

12°C020 7458 4949 Book Now

RARE Plumbing London heating engineer working on a central heating system in a luxury London property

Heating Engineers

Heating Engineer in London

Gas Safe registered heating engineers covering system design, diagnostics, installation and optimisation. Beyond repairs — engineering your heating system to perform correctly.

020 7458 4949 Book Now

Gas Safe Registered

24/7 Available

4.9★ Rated

Since 2013

Book This Service

Available 24/7. Gas Safe registered engineers.

Engineering, Not Just Repairs

The engineer, not just the installer

Most heating companies send engineers to replace parts. RARE's engineers diagnose systems — understanding why a fault occurred, not just what component failed.

RARE's team calculates heat losses before specifying boilers. We test pump duty points before commissioning. We check inhibitor concentration and water quality on every major visit. We configure weather compensation on compatible boilers to deliver genuine efficiency improvements.

Boiler repairs, servicing & installation
Heat loss calculations & boiler sizing
Central heating system design & installation
Radiator replacement & balancing
Power flushing & chemical cleansing
Wet underfloor heating — installation & repair
Hydraulic separation & low-loss headers
Weather compensation configuration

Book a Heating Engineer

Gas Safe registered. Available 24/7. Fixed transparent pricing.

020 7458 4949 Book Online

Engineering Expertise

What our heating engineers actually do

Heating system design

We design systems from first principles — calculating room-by-room heat loss, selecting correctly sized boilers and emitters, designing pipework runs and specifying controls.

Hydraulic separation & low-loss headers

In systems with multiple heating circuits — underfloor heating, radiators and a hot water cylinder — hydraulic separation prevents one circuit from starving another of flow.

Weather compensation

Weather-compensated boilers modulate output based on outdoor temperature — delivering exactly the heat required. We configure weather compensation on compatible Vaillant, Viessmann and ATAG boilers.

Pump sizing and selection

An incorrectly sized circulation pump causes noise, poor heat distribution and premature failure. We calculate system resistance curves and select pumps with matching duty points.

Plant rooms and large properties

RARE engineers regularly work in multi-boiler plant rooms serving London townhouses, mansion blocks and commercial premises. We design and install cascade systems, pressurisation units and BMS interfaces.

System diagnostics

When other engineers have failed to resolve a fault, we are frequently called in as a second opinion. Our systematic approach identifies causes that a visual inspection misses.

Boiler flue design

Incorrect flue design causes recirculation, condensate problems and boiler lockouts. We survey flue routes, calculate flue lengths against manufacturer limits and correctly terminate concealed or extended flues.

Water treatment and inhibitors

We test pH, inhibitor concentration and magnetite content on every major visit — and prescribe the correct treatment including water softener integration to reduce limescale.

What our clients say

"RARE diagnosed and fixed our heating problem in one visit — something two other engineers had failed to do. Methodical, knowledgeable and completely transparent."

Oliver B.

Hampstead

"Brilliant service from start to finish. The heating engineer explained every decision, fixed the zone valve fault and had heat back on within an hour."

Fiona S.

Chelsea

"Used RARE to install Heatmiser Neo across our five-bedroom house. Exceptional quality of work, zero mess and the system works flawlessly."

Marcus W.

Notting Hill

You May Also Need

Boiler Repairs

Emergency & planned boiler repairs. Gas Safe engineers, same-day response, all major brands.

Central Heating

Full central heating system design, repairs, balancing and installation across London.

Underfloor Heating

UFH design, installation and repair — heat loss calculations, manifold balancing, Heatmiser controls.

PPM Membership

Annual care plan including boiler service, system water test and priority call-out.

Local Coverage

Serving London's most iconic neighbourhoods.

Our engineers are established across prime London — near landmarks including Berkeley Square, Harrods, Eaton Square, Regent's Park and Hampstead Heath.