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UNVENTED CYLINDER INSTALLATION PRICES STARTING FROM £1400 SUPPLY & FIT
Since 1986, unvented hot water cylinders have become more and more popular. An unvented cylinder takes its water supply directly from mains, so there is no need for the water tank in the attic which saves a lot of space. Another advantage is that the cylinder is supplied directly from the cold mains which delivers a higher pressure and more reliable flow of water.
At Master Gas London all our engineers are G3 qualified which is a requirement when working on an unvented cylinder.
Master Gas London are on hand to design, plan & carry out your new unvented cylinder installation.

ELECTRIC INSTANT HOT WATER HEATERS PRICES STARTING FROM £558 SUPPLY & FIT
Instantaneous water heaters deliver heated water immediately from the point of use and are also energy efficient as they have no standby energy losses. The compact design helps to optimise space in any room size as it eliminates the need for centrally stored hot water cylinders which also saves on electricity usage. The instantaneous water heater offers an innovative solution in properties with minimal hot water requirements or remote areas of the home, such as an additional basin or outbuilding etc. Instantaneous water heaters are available in single or multi point. All that is required to install an instantaneous water heater is access to the mains water and electricity outlets.
Master Gas London are on hand to design, plan & carry out your new instantaneous water heater installation.

UNVENTED CYLINDER SERVICE £120
Most of us are probably guilty of not maintaining products and devices religiously each year because let’s face it – it’s not cheap. We get a notification that a service is due on our car and the first thing we think is ‘more expense’, but when it comes to an unvented hot water cylinder an annual service is vital to ensure your safety.
Many homeowners are unaware that the unvented cylinder within their home is a pressurised system and therefore requires regular maintenance by a G3 qualified engineer. This will allow the engineer to inspect all the safety devices on the cylinder, whilst also allowing you to raise any concerns you may have regarding the cylinder’s performance should there be any. This is not just a visual check; the engineer will carry out a full assessment:
- Check the installation conforms to Part G3 of the Building Regulations
- Check that all the temperature controls are operational
- Check that all pressure controls and relief valves are operating correctly
- Inspection of all key safety devices
- Assessment of general cylinder condition

Hot water cylinder repair
If your hot water cylinder is damaged, a professional plumber is required. Repairing a hot water cylinder is something which must be done professionally and from the right person. Master Gas can fix or even convert your system with a new combi boiler if required.
Unvented Hot Water Cylinders
An unvented hot water cylinder stores water that is directly supplied from the mains water supply into the property. The hot water is subsequently heated using electrical elements (immersion heaters) within the cylinder or indirectly from a boiler (this is explained further down ‘Indirect vs. Direct’). Due to the cylinder operating at mains pressure, they are capable of supplying multiple outlets with hot water at excellent flow rates. With your hot water being mains pressure, your hot water delivery will dramatically improve. The term ‘unvented’ derives from the cylinder not being vented to the open atmosphere.
Why are we a boiler breakdown industry leader?
Master Gas offers a dependable, quality service carried out by our trusted group throughout all of London. Master Gas is completely qualified to take care of your plumbing, gas and heating needs, supplying clean, efficient and cost-effective services across London.
Master Gas heating & plumbing are totally equipped to deal with boiler Installations or annual boiler inspections. We specialize in fault finding diagnostics, new central heating systems, boiler replacements and Cooker/Hob installations.

Master Gas London is a family run business based in London. Being near the centre of London allows us to cover a large area. Master Gas prides itself on giving a top quality service at a price that is attractive to all budgets. All our workforce are Certified Gas Safe Engineers which enables us to Supply a professional service.
Strategic and Tactical
Founded on Trust,Service, & Quality Work
We love what we do, and we believe in it. It’s not just plumbing to us, but a philosophy applied to every area of our lives. Quality means doing it right when no one is looking.
The dedication to fulfilling our customer’s needs and wants has always been imperative to the way we operate and we adapt our services in order to achieve this.
Prices starting from £84
Even when your boiler has suffered a complete breakdown, purchasing a new, expensive replacement may not be necessary. At Master Gas, we stock a full variety of boiler parts and spares. This allows us to make various repairs to boilers more efficiently.
Prices Starting From £1500
At Master Gas, we are always on hand to offer advice so that you can make a more informed decision when investing in new boiler installation. If you need an old Combi swapped or system conversion we can help.
If your boiler has broken and you need a new one, Master Gas experts can be on hand to fit your new boiler. All installation prices include the following; *(Boiler, power flush all radiators, magnetic filter, scale filter, thermostat, building regulations, warranty & all labour)*
A very high standard of work, when installing replacement boilers or full heating systems, it is very important to us. We only install top brand name boilers such as Valiant, Baxi, Worcester and Ideal, and use only the highest quality materials, yet still, manage to offer very competitive prices for heating installation work. All Boilers come with a warranty between 2-10 Years depending on the boiler you choose. Upon completion of your boiler installation, we register the appliance with Gas Safe and the manufacturer.
Prices Starting From £2500
At Master Gas, we are always on hand to offer advice so that you can make a more informed decision when investing in new boiler installation. If you need an old Combi swapped or system conversion we can help.
If your boiler has broken and you need a new one, Master Gas experts can be on hand to fit your new boiler. All installation prices include the following; *(Boiler, power flush all radiators, magnetic filter, scale filter, thermostat, building regulations, warranty & all labour)*
A very high standard of work, when installing replacement boilers or full heating systems, it is very important to us. We only install top brand name boilers such as Valiant, Baxi, Worcester and Ideal, and use only the highest quality materials, yet still, manage to offer very competitive prices for heating installation work. All Boilers come with a warranty between 2-10 Years depending on the boiler you choose. Upon completion of your boiler installation, we register the appliance with Gas Safe and the manufacturer.
Prices Starting From £84
If you need a Landlord’s Annual Gas Safety Inspection (CP12) or an Annual Gas Boiler Service, one of our approved Gas Safe® registered engineers can provide you with a Gas Safety Inspection (CP12) plus carry out an annual boiler service to help you keep your boiler running smoothly and maintain the warranty.
Prices Starting From £3500
At Master Gas, we recognise that customers require more pressure at their hot taps, and are fed up of the hot water running out. In situations where a combi boiler will not be adequate, Master Gas can upgrade the system from the old copper cylinder to a stainless steel unvented cylinder (i.e. Megaflo).
Prices Starting From £4500
If you are in need of a full central heating installation (i.e. new boiler, new radiators & new pipework throughout the entire property) Master Gas can plan, design & execute the task at hand.
We’re the UK’s top independent heating specialist in Walthamstow. Trusted by our clients to keep them safe and warm through which they are, every day of this year. Our expert and friendly staff listen to, understand and react to our customers. Always providing value for money, uncomplicated and worry-free solutions. We offer trusted advice on the most recent energy saving products.
The Process
Our Company
Master Gas ensures that our customers are 100% satisfied, getting the work done correctly, the first time. We hope you can find everything you want.
We have 25 years experience in boiler repair and boiler installations
Our Featured Works
Boiler Installation Made Easy
At Master Gas, we know just how crucial it is to get your heating back up and working as soon as possible. Master Gas is recognised for carrying out unrivalled Emergency boiler repair service. With over 25 years of experience carrying out emergency boiler repairs across London and Essex. We are based in the centre of Walthamstow, E17 in between Walthamstow Village and Upper Walthamstow we’re best positioned to carry out this work quickly, efficiently and at the best prices possible.
Get In Touch
0203 667 7276
You can contact Master Gas 24 hours a day and a member of our team will only be pleased to receive your call request.
By using Master Gas you can rest assured that your job will be completed by experts and to your satisfaction, not forgetting, of course, our workmanship guarantee. Call today