Safe, legal, certified
G3 qualified unvented work in Manchester
All unvented hot water cylinder work across Manchester carried out by G3 qualified engineers - so your repair, service or install is safe, legal and properly certified. Fully insured, fully documented.
What G3 means, in plain English
G3 qualified unvented work across Manchester
“G3” is simply the recognised qualification for working safely on unvented hot water cylinders ‑ the sealed, pressurised tanks that heat most Manchester apartments.
Because these cylinders hold water under mains pressure, certain work on them must legally be done by a G3 qualified engineer. It protects you, your flat and your neighbours. All HotFix engineers are G3 qualified and fully insured, so every job ‑ repair, service or install ‑ is done to standard and certified.
We work on all common apartment cylinder brands:
What needs certifying?
Unvented cylinder work that needs G3
From safety valves to full installs, certain cylinder work must be G3 certified. Here’s what we cover safely and legally across Manchester.
No hot water in the apartment
Nothing coming through hot at any tap. Often a tripped immersion, failed heater element or a control fault ‑ we’ll find it fast.
Hot water only getting lukewarm
Water heats but never gets properly hot, or runs out fast. Usually a thermostat, element or blending-valve issue.
Faulty immersion heater
The immersion won’t heat, keeps tripping the electrics or has burnt out. We replace immersion heaters and elements.
Faulty thermostat
Water too hot, too cold or wildly inconsistent. A failed cylinder thermostat is one of the most common causes.
Blending / mixing valve issues
A seized or failed blending valve can leave you with scalding or lukewarm water. We test, adjust and replace them.
Expansion vessel problems
Dripping, banging pipes or discharging water often points to a failed expansion vessel. We recharge or replace them.
Pressure relief valve issues
Water discharging outside or from the tundish usually means a PRV or expansion fault. We diagnose it safely.
Tundish dripping
That little clear fitting dripping or overflowing is a warning sign ‑ we’ll find why it’s discharging and put it right.
Cylinder making noise
Banging, rumbling or hissing from the cylinder or pipes. Often limescale, expansion or valve related ‑ and fixable.
Hot water cylinder leaking
Water pooling around the cylinder or in the cupboard below. We identify the source and advise repair or replacement.
High-rise & apartment systems
Pressure, flow and shared-system quirks in flats and towers. We work in city centre developments every week.
Emergency hot water
No hot water and can’t wait? We offer emergency hot water repairs across Manchester where possible ‑ just call.
Need certified unvented work?
Repairs, servicing and installs on unvented hot water cylinders across Manchester ‑ all carried out by G3 qualified engineers, safe, legal and certified. Call now.
Certified work & more
The full range of G3 unvented work
Every service below is carried out by a G3 qualified engineer ‑ repairs, servicing and installs, all documented to standard.
Electric hot water cylinder repairs
Fast diagnosis and repair of electric and unvented cylinders ‑ elements, thermostats, valves, controls and leaks.
Unvented cylinder servicing
Annual servicing to keep your unvented cylinder safe, efficient and compliant ‑ vessels, valves and safety checks.
Unvented cylinder replacements
Full replacement of failed or ageing cylinders, sized correctly for your flat, with tidy pipework and certification.
Immersion heater replacements
Replacement of burnt-out or tripping immersion heaters and elements ‑ a common apartment hot water fix.
OSO cylinder replacements
Specialists in OSO hot water cylinders ‑ repairs and like-for-like replacements common in Manchester apartments.
G3 qualified unvented work
All unvented work carried out by G3 qualified engineers, so it’s safe, legal and properly documented.
Landlord & letting agent work
Reliable hot water repairs, servicing and installs for landlords, letting agents and apartment blocks.
Emergency hot water repairs
No hot water and it’s urgent? We attend emergency hot water callouts across Manchester where possible.
Real certified work
From non-compliant to signed off
Poorly fitted, uncertified cylinders put right and properly documented ‑ the compliant work we deliver in Manchester flats.
Where we work
Certified unvented work across Manchester
We carry out G3 qualified unvented work throughout Manchester and Salford’s apartments, flats and high-rise developments.
Done properly
Certified, documented and guaranteed
Every job is completed to G3 standard, tested, and documented ‑ so you have proof it was done right for warranty and compliance.
Photos shown are examples of typical HotFix cylinder work.
Why choose HotFix
Qualified and accountable, not a gamble
Unqualified unvented work can void warranties and endanger your block. HotFix engineers are all G3 qualified, insured and accountable.
G3 qualified
Every engineer is G3 qualified ‑ the recognised standard for working safely on unvented cylinders.
NAPIT registered
NAPIT registered, giving you independently verified competence on certified work.
Public liability insured
Fully insured for unvented work in your home or across an apartment block.
Invoices & guarantees
Every certified job is invoiced and documented, with the paperwork you need.
G3 qualified unvented work in Manchester
If you’ve been told your hot water cylinder needs “G3 qualified” work, and you’re not sure what that means, here it is in plain English. G3 is the recognised building-regulations qualification for working safely on unvented hot water cylinders ‑ the sealed, pressurised tanks that store and heat hot water in most modern Manchester apartments. Because these cylinders hold water at mains pressure, the law requires that certain work on them is carried out by a suitably qualified (G3) engineer. Every HotFix engineer is G3 qualified and fully insured, so any work we do on your cylinder is safe, legal and properly certified.
Why unvented cylinders need a qualified engineer
A traditional hot water tank was open to the air, fed by a small tank in the loft. An unvented cylinder is different ‑ it’s sealed and connected straight to the mains, which gives you strong, even pressure at every tap and shower. The trade-off is that a sealed, pressurised, heated vessel has to be treated with respect. It has several safety devices working together, and if they’re wrong or poorly maintained, the consequences are serious. That’s exactly why G3 exists, and why a general handyman shouldn’t be touching these systems.
The safety parts we’re trained to get right
On every unvented job, a G3 engineer checks the parts that keep the cylinder safe ‑ and we explain them simply:
The expansion vessel
Water expands as it heats. The expansion vessel absorbs that extra volume so pressure doesn’t build up dangerously. A failed vessel is one of the most common causes of a dripping tundish or water escaping outside.
The pressure and temperature relief valves
These are the cylinder’s last line of defence ‑ they release water if pressure or temperature ever climbs too high. They must be the right type, correctly fitted and working freely.
The tundish and discharge pipe
The tundish is the small clear fitting that should stay dry. It, and the pipe that carries any released water safely away, must be installed to the regulations ‑ not bodged.
Repairs, servicing and installs ‑ all certified
G3 covers the full range of unvented work we do across Manchester: repairs when something’s gone wrong, annual servicing to keep the cylinder safe and warranty-valid, and full installs and replacements when a cylinder reaches the end of its life. Whatever the job, you get documentation that proves the work was done to standard ‑ which matters for your manufacturer’s warranty, for building compliance, and if you ever sell or let the property.
Why certification protects you
Certified work isn’t just red tape. It protects your warranty (manufacturers can refuse claims on cylinders worked on by unqualified people), it protects your home insurance position, and it protects your neighbours ‑ a badly handled pressurised cylinder can cause serious water damage in a block of flats. For landlords and letting agents, using a G3 qualified engineer is part of keeping a property safe and demonstrating you’ve done things properly.
Trusted for unvented work across Manchester
HotFix is the specialist hot water arm of City Centre Maintenance MCR Ltd ‑ a registered, fully insured company. We carry out G3 qualified unvented work throughout Manchester’s apartment areas: the city centre, Salford, Deansgate, Ancoats, the Northern Quarter, MediaCity, Castlefield, Hulme and the surrounding developments. Every job is invoiced, certified and guaranteed, and we explain everything in plain language rather than hiding behind jargon.
Do I legally need a G3 qualified engineer?
For most work on an unvented (sealed, pressurised) hot water cylinder, yes ‑ it falls under building regulations and should be carried out by a G3 qualified engineer. Using someone unqualified can invalidate your warranty and your insurance, and it puts your flat and your neighbours at risk. It’s simply not worth the gamble on a pressurised system.
Common questions about G3 unvented work
What does G3 actually stand for?
G3 refers to the part of the building regulations covering unvented hot water systems. An engineer with the G3 qualification has been trained and assessed to work on these pressurised cylinders safely ‑ installing, servicing and repairing them to standard.
Will I get a certificate?
Yes. We provide documentation showing the work was done to standard, which matters for your manufacturer’s warranty, for building compliance, and if you ever come to sell or let the property.
Is my cylinder unvented?
If it’s a sealed metal cylinder connected straight to the mains (with no separate tank in the loft) and gives strong pressure at the taps, it’s almost certainly unvented. Send us a photo and we’ll confirm.
Can a G3 engineer work on any make of cylinder?
Yes ‑ the G3 qualification covers unvented cylinders generally, so we service and repair all the common apartment brands, including OSO, Megaflo, Gledhill, Santon, Heatrae Sadia and Telford.
Book G3 qualified unvented work in Manchester
If your unvented cylinder needs a repair, a service or a replacement ‑ and you want it done safely, legally and certified ‑ talk to us. Send a photo of your cylinder by WhatsApp, or fill in the form below, and a G3 qualified engineer will advise you and get the job done to standard.
Related HotFix services in Manchester
- Electric Hot Water Cylinders Manchester
- Electric Hot Water Cylinder Repairs Manchester
- Unvented Cylinder Servicing Manchester
- Unvented Cylinder Replacements Manchester
- Immersion Heater Replacements Manchester
- OSO Cylinder Replacements Manchester
- Hot Water Repairs for Landlords Manchester
- Emergency Hot Water Repairs Manchester
What customers say
Trusted by Manchester residents, landlords & agents
“No hot water in our apartment on a Sunday. Called HotFix, they diagnosed a failed immersion, replaced it and we had hot water back the same day. Clean, polite and gave a proper invoice.”
“Our OSO cylinder was leaking. They replaced it with a like-for-like unit, tidied all the pipework and certified the unvented work. Exactly what our block needed.”
“As a letting agent I use HotFix for cylinder issues across several flats. Reliable, properly qualified and they always send an invoice and guarantee. Highly recommend.”
Review examples ‑ to be replaced with live Google reviews.
Book G3 qualified unvented work
Whatever your unvented cylinder needs, send a photo by WhatsApp or fill in the form ‑ and a G3 qualified engineer will advise you and get it done to standard.
Get in touch
Book a repair or ask a question
Fill in the form and attach a photo of your cylinder if you can ‑ it helps us advise you faster. Prefer to talk? Call us directly.
You can also send photos by WhatsApp. We usually reply the same day.
Piccadilly Business Centre, Aldow Enterprise Park
Manchester, M12 6AE
Send photos by WhatsApp. Snap the cylinder, its label, the fault, the tundish or the immersion heater and we'll advise the next step.
HotFix is the electric hot water cylinder specialist service of City Centre Maintenance MCR Ltd. G3 qualified repairs, servicing and installs for unvented and electric cylinders across Manchester.