Unvented Hot Water Cylinders (G3) in Hull & Kingswood

Unvented hot water systems require specialist knowledge and certification. Kwikhot Heating Solutions provides professional unvented hot water cylinder installation, servicing, and repairs across Hull and Kingswood, carried out by G3-qualified, Gas Safe registered engineers to ensure safety and compliance.


G3 qualified Engineers


Local Hull & Kingswood coverage


Installation, servicing & repairs


Clear pricing with no hidden extras

Gas Safe registered (921566)

Kwikhot Heating Solutions Ltd

What is an unvented hot water cylinder

Emergency Boiler Repair

An unvented hot water cylinder is a high-pressure system that delivers hot water directly from the mains, providing strong flow to multiple outlets without the need for a cold water storage tank. Commonly known by brand names like Megaflo, these cylinders provide high-pressure showers but require specialized handling

Because these systems operate under pressure, UK regulations require that only G3-qualified engineers install, service, or repair them.

Range of unvented hot water cylinders suitable for G3 installation and servicing
Unvented hot water cylinder with copper pipework and safety valves installed in a UK property.

Our unvented cylinder services

Emergency Boiler Repair

We provide a complete range of unvented hot water cylinder services, including:

  • Installation of new unvented cylinders

  • Servicing and annual maintenance

  • Fault diagnosis and repairs

  • Replacement of safety valves and components

  • Pressure and expansion vessel checks

All work is carried out in line with current safety standards to protect both occupants and property.

G3 Faults: Leaking Tundishes, Pressure Loss & No Hot Water

Emergency Boiler Repair

We regularly attend properties with issues such as:

  • No hot water or inconsistent temperatures

  • Loss of water pressure

  • Leaking safety valves

  • Expansion vessel faults

  • Overheating or system lockouts

  • Noisy operation

We diagnose faults accurately and explain all repair options before carrying out any work.

Why G3 qualification matters

Emergency Boiler Repair

Unvented systems store water under pressure and rely on multiple safety devices. Incorrect installation or servicing can be dangerous and may invalidate insurance.

Our G3 qualification ensures:

  • Compliance with Building Regulations

  • Correct installation of safety devices

  • Safe operation of high-pressure systems

  • Peace of mind for homeowners and landlords

For Landlords: We can include your annual G3 safety check as part of your CP12 and Boiler Service package for total property compliance.

Unvented Hot Water Cylinder Costs

Emergency Boiler Repair

Costs vary depending on the system type, fault, or whether installation, servicing, or repair is required.

  • Clear, upfront pricing

  • No unnecessary work

  • Honest advice on repair vs replacement

Local G3 Unvented Cylinder Specialists in Hull

Emergency Boiler Repair

We provide specialist G3 support across the region, bringing expert knowledge to modern Kingswood developments and high-occupancy HMOs that rely on high-pressure hot water. Our engineers are specialists in leading brands such as Megaflo, Telford, and Ariston, providing everything from annual safety maintenance to emergency pressure relief and safety valve replacements

We proudly serve homeowners and landlords across:

  • Hull

  • Kingswood

  • Cottingham

  • Beverley

  • Hessle

  • Surrounding East Yorkshire areas

If you’re unsure whether your system is vented or unvented, we’re happy to advise

Unvented Hot Water Cylinder (G3) -Frequently Asked Questions - Hull & Kingswood

Is G3 certification legally required?

Yes. UK regulations require that unvented hot water systems are installed and serviced by engineers holding a valid G3 qualification

How often should an unvented cylinder (G3) be serviced?

Most manufacturers recommend annual servicing to ensure safety devices are functioning correctly and to maintain warranties.

Can you repair existing unvented cylinders?

Yes. We diagnose and repair faults on most unvented cylinder brands and systems.

Do unvented systems need a cold water tank?

No. Unvented systems take water directly from the mains, providing higher pressure and consistent flow.

Do landlords need unvented systems checked?

Yes. Landlords are responsible for ensuring unvented hot water systems are safe and properly maintained.

TESTIMONIALS

What Our Customers Say About Our Heating Services

What Our Customers Say About Our Heating Services

Book Your Service

Contact us to arrange an unvented cylinder inspection, service, or repair at a convenient time.

G3 Safety Inspection & Diagnosis

A G3-qualified engineer checks safety devices, pressure controls, and system performance.

Professional Work & Certification

Any work is completed safely and in line with regulations, with documentation provided where required.

Request A Free Emergency Boiler Repair Quote