ABOUT US
Specialist Heat Interface Unit Engineers in London
HIU Experts is a specialist Heat Interface Unit engineering company serving residential properties, apartment blocks and communal heating schemes across London. We don't do general plumbing or boiler work, HIUs are the only thing we focus on.
WHO WE ARE
Why We Focus on HIUs and Nothing Else
Most heating companies treat a Heat Interface Unit as just another type of boiler. It isn't. An HIU combines a plate heat exchanger, pressure independent control valves, actuators, sensors and on many properties a heat meter, all working together to deliver heating and hot water from a communal or district network.
HIU Experts was set up around a simple idea: a specialist who only works on HIUs will understand the equipment, fault patterns and controls better than an engineer who sees an HIU once a month between boiler jobs.
That focus shapes everything we do from how we diagnose a fault, to which brands we train on, to how we report back to property managers responsible for dozens of units across a block.
FOCUS
100% HIU
BRANDS SERVICED
7+
COVERAGE
LONDON-WIDE
WHO WE SERVE
RESIDENTIAL & PORTFOLIOS
HOW WE DIAGNOSE
Our Approach to HIU Fault Finding
An HIU fault is rarely random. It usually traces back to one of a small number of components or to how the unit is interacting with the wider heating network. Our approach is built around checking each of these systematically.
01
Flow & Control Valves
Checking PICV performance and flow regulation against design conditions.
04
Temperatures & Pressure
Comparing flow and return readings against required operating conditions.
02
Actuators & Sensors
Testing control response and identifying failed or sticking components.
04
Metering Systems
Investigating connected heat metering and replacement issues.
03
Heat Exchanger Performance
Checking heat transfer efficiency, blockages and fouling.
04
Wider System Interaction
Considering how the HIU behaves within the building's communal heating network.
WHAT MAKES US DIFFERENT
A Specialist, Not a General Plumber
A general plumbing or boiler engineer can often get an HIU running again. Getting to the actual root cause, a failing actuator, a fouled heat exchanger, a miscalibrated flow sensor, takes equipment-specific knowledge. That's the gap we fill.
HIU-Only Focus
Every visit, every training session and every van stock item is built around Heat Interface Units specifically.
Root-Cause Diagnosis
We investigate components, controls, flow, temperature and pressure rather than simply replacing parts.
Major HIU Brands
Experienced across Danfoss, Caleffi, Evinox and other major HIU manufacturers.
Clear Communication
Plain-English explanations of what's wrong and what it takes to fix it, before we start any work.
PROCESS
How We Work With You
We do not try to be a general plumbing firm. Our positioning is deliberate: specialist HIU engineers for London.
01
Tell Us the Problem
Call or WhatsApp us with your postcode, HIU brand and the issue you're experiencing.
02
Diagnose the HIU
Our engineer assesses the unit and investigates the underlying fault, not just the symptom.
03
Recommend the Right Solution
We explain what needs to be repaired, serviced or replaced before any work begins.
04
Complete the Work
We carry out the agreed work and leave you with a clear record of what was done.