Boiler Installs

Approved installer of ATAG, Viessmann and Vaillant boilers, all manufacturers of high quality efficient boilers that comply with #BoilerPlus.

For more information about gas boiler installation services, please get in touch

Boiler Repairs

Has your boiler has broken down?

London GAS are very experienced in fault finding and repairs and can usually obtain spares parts next day.

Boiler Servicing

An annual boiler service is highly recommended to ensure that your boiler is operating safely and working efficiently.

Neglected boilers lead to costly breakdowns, higher energy bills and can void the manufacturer warranty. To book a boiler service, just call or visit to the contact page.

LPG & Leisure

We install, service and repair all domestic LPG appliances, incl. boilers, hobs, cookers, hot water heaters, fires, barbecues (BBQ) and fire tables.

We can convert from Natural Gas to LPG – and vice versa.

Leisure Appliances

We specialise in installing both Nat Gas & LPG appliances in your garden.

More details below

London LP Gas Engineer

LPG (Liquid Petroleum Gas) includes Propane (patio gas) and Butane.

They come in various cylinder sizes depending on the size of the appliance. We will calculate pipe size, regulator size and cylinder size to match the demand of your LPG appliance(s)

Power Flush

Power Flushing

Power flushing is an essential element to energy and heating system efficiency. 
It’s often mandatory for new installs, else it voids the boiler warranty. 

I like to use the analogy of buying a new car and reusing the engine oil from the old car to save a few pennies.
It makes no sense.

The Norstom Proflush has its own integral pump, so even if the existing boiler isn’t working, I can still power-flush the system.


Additionally Norstrom Proflush has reverse flow, which helps to remove magnetite along with two powerful magnets to capture the magnetite from the system.


Chemical use to clean a heating system is normal, Norstrom ‘Long Life 410’ is designed to work with cold water.

Landlord Gas Safety Record - CP12

Landlord Gas Safety Record

A landlord is legally required to provide their tenant with a landlord gas safety certificate annually.

If you have anyone install or work on a gas appliance in your home, they must to be on the Gas Safe Register If they are not, then they are working illegally.

Fully insured, with two million pound public liability insurance.

All work guaranteed.

Gas Safe Registered.



ATAG are a Dutch firm, they’ve been operating in the UK for decades in the Commercial sector, more recently delved into Domestic.

They’re an award winning boiler manufacturer at the forefront of technological advancement in efficiency.

Their Economiser range incorporates passive heat reclamation which is one part of #BoilerPlus.

Rather than release this energy as waste, they engineered the Economiser, an environmentally friendly innovation that recycles the flue gases for a second time, resulting in optimum energy efficiency.

ATAG offers one of the best warranties available, a full Lifetime warranty on their Heat Exchanger and standard 10 year parts and labour warranty on the boiler itself.

Viessmann 100-W Combination boiler


Viessmann are a German manufacturer, with a very good reputation for quality. 

London GAS have attended Viessmann training courses so can offer extended warranties as well as specific product knowledge.

Viessmann has been named by German consumers as the top Energy & Heat brand for 2019 in the Handelsblatt Brand of the Year rankings.

They offer a 10 year warranty on the heat exchanger.

The standard boiler warranty is 5 to 7 years from the date of installation, with an option to increase to 10-12 years (chargeable) if the boiler is registered by a Viessmann approved Installer.

Gas Fire Pits

Solus LPG Fire-table

LondonGAS specialise in installation of gas fire-tables (also known as fire-pits and fire-bowls).
They can be Natural Gas or Propane.
Propane is the more common option.

Things to consider when choosing which gas type.

With Natural Gas, I must take into account every other gas appliance on the system, the boiler, hob, cooker, fires, and add up all the kW ratings to ensure the system can accommodate the new fire-table, without depriving gas from any of the other appliances.
I also have to ensure the gas meter is large enough to be able to deliver the required quantity of gas to the new fire-table, as well as the other appliances at the same time, with everything on maximum.
Often this would involve a site survey.

A quick example.
Say you have a U6 /G4 gas meter, (a standard gas meter for most average size dwellings), it can deliver roughly 64kW.
In your home you have a 24kW boiler and a 7kW gas hob.

Total 31kW.

64kW minus 31kW leaves approx 33kW spare.
The Solus Hemi has a 20kW burner, so on paper, the gas meter does have capacity to add the new appliance to the system.

The only remaining variable is the pipe size… are the existing gas pipes big enough to take the new appliance?
This will be dictated by the length of pipe from the property to the fire-table, and what else is connected to it. Most of the time I’ll take a supply from as close to the gas meter as possible to the fire-table.

LPG (Liquid Petroleum Gas) bypasses much of the Natural Gas issues, as I don’t have to allow for other appliances, or gas meter size limitations.
It’s a stand alone sealed system, one supply, one appliance.
We use Propane, not Butane.

Which model of fire-table you purchase will dictate the propane cylinder size.
The Solus Hemi for example has a 20kW burner, whilst the Solus Halo has a 12kW burner.
A 20kW burner will require a minimum of a 19Kg cylinder. Whereas a 12kW burner will only need a 13Kg cylinder.

External gas pipes.
I use tracpipe, which is designed for both Nat Gas & LPG. It is a stainless steel flexible pipe that has a rubber covering, designed to offer protection for buried gas pipes. So it can be buried as is, no additional lagging required.
It must be buried to at least 375mm below surface in most gardens, below patios, foot traffic areas.

For areas where cars drive over it, that depth will increase. If the tracpipe needs to be buried then you’ll need to arrange for the trench to be dug in advance of my visit, I don’t do this. 

For installs with an overall gas pipe length of less than 10 meters, I use DN15 tracpipe, which has an external diameter of 22mm.

To comply with COP32 (Code of Practice 32) all regulators now must have an OPSO (Over Pressure Shut Off) valve. Even for single cylinder installs.

No matter which cylinder you need, 13Kg or 19Kg, they must be POL fitting (Prest-O-Lite). Left handed thread screwed type, not the clip-on type.
This is to accommodate the Propane regulator which needs to be 4Kg/h and have a 1/2″ inlet.

The cylinder must sit on a flat level surface, such as a flagstone or tarmac, they can’t sit directly on soil or un-firm ground.

The only thing you as the client need to arrange in advance of my visit is the gas cylinder. You have to initially purchase the cylinder from somewhere like Calor or and setup an account with them.
Once your cylinder is empty, they’ll exchange the empty cylinder for a full one, you only pay for the gas.
I supply everything else, the regulator, hoses, wall block, pig tails, tracpipe & fittings.

LPG Cylinder Distances

What’s the difference between a boiler service and a gas safety check?

When it comes to having a gas boiler inspected, you may be confused about whether you need to book in a gas safety check or a service. The two things are quite different, so read on to find out what each involves, as well as which one you might need.

In this article, we explain what each of your heating system controls do and what temperature they should be set at in order to keep your home cosy this winter.

What is a gas safety check?

A gas safety check isn’t just specific to boilers, but relates to any gas appliances, including cookers and fires too. It doesn’t involve the inspection of specific parts. Instead, it ensures that everything is running as it should be. This could include checking:

  • The boiler pressure
  • The air supply
  • That gas is being burned correctly and efficiently
  • Flues and chimneys to ensure the flue gases can escape
  • Safety devices
Carbon monoxide is colourless and odourless, meaning it can only be detected using carbon monoxide alarms. These devices should be placed near any gas appliances so that you can be made aware of a potential leak. The ‘safety check’ can let you know that your boiler is safe to operate whilst ‘a service’ will ensure efficient running.

The safety check will also establish that any cut-off devices, such as safety valves, are working. These devices ensure that if there is a problem with your boiler, the gas supply to the boiler will be shut off to keep you and your household safe.

A gas safety check must be carried out by a Gas Safe registered engineer. You can ask for their ID beforehand to ensure they have the right qualifications and accreditations.

It’s particularly important that landlords keep up to date with gas safety checks in their properties, otherwise they could be neglecting their responsibilities under the Landlord and Tenant Act 1954.

What does a boiler service involve?

The gas safety check ensures that the appliance is running safely, a boiler service involves checking the individual boiler parts to make sure they’re clean and working efficiently.

You could think of a boiler service and a safety check as the equivalent of a service and MOT on your vehicle. The MOT checks that it’s safe to drive on the road while the service checks individual parts and involves changing fluids such as oil if needed. A car’s MOT is equivalent to a boiler’s safety check, while the service is similar in principle to a boiler’s service.

Your boiler will need its first service 12 months after the installation date and for every 12 months thereafter.

Servicing isn’t a legal requirement, however it’s often a requirement to maintain your manufacturer warranty valid and will keep your boiler working efficiently, saving you money on your energy bills. A service involves taking off the front cover of the boiler and inspecting and cleaning the parts inside. The heating engineer will make sure that there are no leaks in any of the pipework and that all of the seals are intact. As with a boiler safety check, the pressure will be monitored and the flue will be examined for safety.

As a boiler burns gas, dirt can be created and deposited on certain parts, such as the burner and heat exchanger. Over time, these deposits can affect the efficiency of your boiler and may even prevent it from turning on altogether. These parts will be looked at and cleaned if needed.

Finally, the expansion vessel will be tested to ensure the correct pressure is in the system and the engineer will ignite the boiler to listen out for any unusual noises.

Once they’re finished, they should make a note of the service details in the manufacturer’s benchmark book.

Which one do you need?

It’s important that your boiler has either an annual service or safety check. As manufacturers state that it is important to have an annual service to maintain your warranty.

To save time, a safety check can be completed on other appliances along with the service on your gas boiler by a Gas Safe registered engineer. They will then advise if other appliances also require a service.

The laws are slightly different for landlords, who have to look after their tenants by ensuring all properties contain safe gas appliances. This means that as a landlord, you must legally have a gas safety check on all gas appliances every year.

You don’t have to have the boiler serviced, however the landlord may still need a service to maintain manufacturer warranty.