Heating.
Cooling.
Comfort.
Gas Safe registered boiler installations, rapid emergency repairs, and high-efficiency air conditioning. Proudly based in Dagenham (RM10) and serving East London & surrounding Essex boroughs.
Syed Ather Hamad Mehmood
Lead Gas Safe Engineer & Founder
No heating? Boiler stopped working?
We're available 24/7 for emergencies across East London
Instant Boiler Cost Estimator
Calculate an accurate, transparent estimate for your home in 3 clicks. Includes supply, Gas Safe installation, system flush, and up to 10-year warranty.
*Fully inclusive of boiler, professional installation, VAT & disposal of old unit.
What Can We Help You With?
All work executed strictly under Gas Safe Registration #975971 by engineer Syed Ather Hamad Mehmood.
Boilers & Heating
Specialist installation, replacement, and power flushing for Vaillant, Worcester Bosch, Ideal, and Baxi systems.
- Combi, System & Regular Boiler Installation
- Rapid Diagnostic Breakdown Repairs
- Annual Efficiency Servicing & Filter Flush
- Smart Thermostats (Hive, Nest, Honeywell)
- Radiator Replacement & Power Flushing
Air Conditioning & Climate
Whisper-quiet single & multi-split air conditioning systems. Provides rapid cooling in summer and energy-efficient heating in winter.
- Domestic Home Office & Bedroom Split Systems
- Commercial Retail & Clinic Climate Control
- A+++ Energy Rating Heat Pump Technology
- Refrigerant Leak Diagnostics & Regas
- Annual Filter Sanitization & Servicing
Gas Safety & Compliance
Accredited gas tightness testing, landlord certificates, and gas cooking appliance installations with digital signoff.
- Landlord Gas Safety Certificates (CP12 - £65)
- CP12 + Boiler Service Combo Package (£99)
- Gas Cooker & Built-in Hob Connections
- Gas Meter Tightness & Pipework Testing
- 24/7 Emergency Gas Leak Tracing
Tell Us What's Happening
Select your symptom below or search your boiler error code for an instant expert breakdown and Gas Safe guidance.
Have a Code on Your Display?
Type your fault code below (e.g. F75, F28, EA, E119, L2, F22) for instant diagnosis:
Professional service without the runaround.
Gas Safe Registered
Fully certified. Registration No. 975971.
Experienced Engineers
10+ years in residential and commercial heating.
Fast Response
Same-day emergency callouts across East London.
Transparent Pricing
Fixed quotes before work begins. No hidden fees.
Quality Workmanship
Manufacturer-backed installations with warranty.
Local & Trusted
Based in Dagenham. Proudly serving our community.
Our Recent Installations & Repairs
Real jobs photographed on-site across Dagenham and East London by Gas Safe registered engineer Syed Ather Hamad Mehmood. No stock photography.
Gas Safe VerifiedWorcester Bosch Flue Gas & Efficiency Analysis
Full digital flue gas analysis with Testo probe, verifying safe CO/CO2 ratios, combustion efficiency, and heat exchanger integrity.
Rapid DiagnosticCombi Boiler Circuit Board & Multimeter Testing
Diagnosing intermittent ignition failure. Traced to a faulty relay on the main PCB board. Repaired same-day without replacing the whole unit.
Master PlumbingPrecision Copper Pipe Soldering & Central Heating
Bespoke 22mm & 15mm copper pipework routing for high-efficiency system boiler installation, including power flush and magnetic filter.
CP12 ComplianceGas Meter Tightness & Pressure Testing
Statutory gas tightness testing using Rothenberger U-gauge manometer to detect micro-leaks across the entire residential gas pipe network.
Kitchen FittingLamona Built-In Gas Hob Installation
Precision worktop clearance fitting, copper isolation valve connection, and burner pressure check for modern fitted kitchen.
Landlord CertifiedRange Cooker Safety Verification & Sign-Off
Annual landlord safety inspection for freestanding multi-burner cooker. Verified flame failure devices (FFD) and stability bracket.
Landlord Gas Safety (CP12)
Up to 2 gas appliances inspected, tightness tested, with digital certification issued on the spot.
CP12 Certificate + Boiler Service
Combined full annual boiler maintenance service plus complete landlord CP12 certification.
What Our Customers Say
Real feedback from homeowners and landlords across Dagenham, Barking, Romford, and East London.
“Professional, punctual and very tidy work. Replaced our old boiler in just a few hours. Highly recommended!”
Mohammed R.
Dagenham
“Called about a gas leak on a Sunday and they came within the hour. Brilliant service.”
Sarah T.
Barking
“Had our office air conditioning installed. Clean work, fair price, and great aftercare.”
James K.
Romford
Heating & Cooling Across Dagenham & Surrounding Areas
Centrally dispatched from 123 Frizlands Lane, RM10. We provide guaranteed same-day emergency boiler callouts and scheduled installations across 12 primary boroughs.
Direct Local Presence in Dagenham
Most homeowners find us directly on Google Maps and Google Business Profile. Our registered office and rapid dispatch hub is at 123 Frizlands Lane, Dagenham, RM10 7HL.
Frequently Asked Questions
In-depth engineering answers regarding boiler installations, landlord CP12 compliance, repairs, and air conditioning.
A like-for-like combi boiler replacement typically ranges between £1,750 and £2,300, depending on the model chosen (e.g. Vaillant ecoTEC or Worcester Bosch Greenstar). A system-to-combi conversion (removing cold water loft tanks and hot water cylinder) typically costs £2,400 to £3,200. Every installation by Reliant includes a digital power flush, a magnetic system filter (Magnaclean), wireless programmable smart controls, and up to a 10-year manufacturer warranty. We provide guaranteed fixed-price quotes before any work commences.
Have a Question Not Listed Here?
Speak directly with lead Gas Safe engineer Syed Ather Hamad Mehmood.
Let's Get Your Home Warm & Safe Again.
Whether it's a new energy-efficient boiler, same-day breakdown repair, annual CP12 landlord check, or cooling air conditioning — we're here to assist.
Or email us directly at sales@reliantheatingandcooling.co.uk