BOILERS & HEATING2018-12-14T10:31:06+00:00


Staunch and Flow is London’s premier Plumber.  All our boiler
engineers are Gas Safe (Corgi Registered) plumbers we service
clients across Central London, South London and West London.  We promise that our Gas Safe (Corgi Registered) plumbing and heating engineers will:

  • Arrive at the arranged time or keep you informed of any delays
  • Explain the problem and how we intend to fix it
  • Treat your property with respect, leaving it in as clean and tidy a state as possible
  • Provide you with all replaced or removed parts from your system. We charge honest prices and only for the work which needs to be carried out (unlike many other companies in the sector)
  • Work to Gas Safe (Corgi-Registered) regulations, putting your safety first
  • Be as much help as we can




All of our boiler service engineers are Gas Safe registered and carry our computerised Domestic Boiler Encyclopaedia® which contains manuals for all domestic boilers built since 1980. This gives us the best possible information to diagnose faults and breakdowns and carry out boiler repairs correctly and efficiently.

Our team has over a hundred years of boiler service experience collectively and have been chosen to participate in the Worcester Bosch partnership Business Initiative Scheme and

london plumber boiler

If you have a breakdown and need your boiler or cylinder serviced or repaired, call Staunch and Flow today…

How we work:
For boiler repairs in the London area we work on our hourly rate and services at a fixed price. Please also see item 13 in our terms and conditions.

We also offer:

  • New Gas Boiler Installation
  • Gas Boiler Replacement

For new boilers or replacements Staunch and Flow operate an estimate/consultancy service. We come to your premises, assess the job and issue a written report specifying the scope and cost of the work.

This means that if you want other estimates for the job you have our specification which you can issue to other bidders. This will enable you to make a fair comparison between the estimates that you receive.

See our RATES


Staunch and Flow are Gas Safe (Corgi Registered) Heating engineers. We can install all types of domestic and commercial boilers, contact us to find out more.

High Efficiency Condensing Boilers: As of April 2005, the government has insisted that all new gas boilers shall be high efficiency models. This is to save energy and reduce CO2 emissions. With high and rising energy bills installing these boilers will save you money.

These boilers are called condensing boilers as they recover a lot of otherwise wasted heat by using the hot flue gases to preheat the return primary water in the system.

This heat recovery means that the invisible water vapour in the combustion gases is condensed back into water which creates a plume of water vapour (like a cloud). Heat efficiency of these boilers is rated at 90-91% efficiency. These boilers reduce gas bills by up to 30%.

Contact us to discuss quotes for gas boiler installations in and around the London area.

Staunch and Flow offer qualified Gas Safe (Corgi Registered) Gas Boiler repair and replacement services in London. Contact us to find out more about our services.

Staunch and Flow have years of experience in reliable, fast boiler repair in and around the London area. If you’re experiencing problems with your boiler (particularly in Winter) then call us for help.

Should I repair or replace my boiler?

At some stage, all Gas boilers suffer corrosion and wear, leading to eventual failure. If there are several faults on an old boiler or a fault requires expensive work and parts, we sometimes recommend installing a new boiler.

We cannot guarantee replacement parts to old boilers will fix the problem permanently, often when boilers start going wrong everything starts to go and it costs more to replace the parts than go for a new boiler.

Our fully qualified Gas Safe central heating engineers will advise you on the best possible course of action and will prepare a competitive quote for any domestic or commercial Gas boiler installation.

Contact us to talk to an engineer today.

Types of Boiler Repairs

Type One:

All modern day boilers are condensing boilers.  This means that they will have a white condense pipe coming out the bottom of the boiler.  In very cold weather if the pipe goes outside to the drain it is possible for it to freeze.  This will then cause the boiler to shut down until the blockage is removed.  To stop this from happening, the pipe should be properly insulated or a larger pipe should be used.

Type Two:

The majority of modern boilers are sealed systems.  You can easily tell if you have a sealed system as there is a pressure gauge on the front of the boiler.  This should stay around 1.2 bars.  The pressure will rise and fall in the system as it heats up, and as it cools down, it should not move more than 0.5 of a bar.  If the pressure is above 2 bars you should call your plumber as it could be quite dangerous.  If the boiler loses all pressure, the heat in the boiler cannot be distributed and this will make the boiler stop working as well.

Brands of common boilers we repair:

Staunch and Flow Plumbers are fully trained in the repair of Worcester, Vaillant, Main, Potterton and Keston boilers. We also service and maintain  unvented hot water cylinders (such as Megaflo, Vaillant, Potterton, Telford, Gledhill, Worcester Bosch, Santo, Viessmann & OSO)

Staunch and Flow – specialist Gas Safe (Corgi Registered) gas central heating engineers

Contact us today for a gas safety consultation

We also offer Landlord gas safety certificates

Gas Work Notification

As of April 2005, the government has made it legally binding on us to inform Corgi every time we install or exchange a gas appliance.

Please note that we are required to notify them of the date we did the work with the address and the postcode.

Part L of the building Regulations: These regulations were instituted to help us conserve energy and reduce the CO2 emissions.

This means that when doing a new installation we need to fit a high efficiency boiler where necessary. In some cases these new boilers (see above) cannot be installed. There is a point scoring system to establish if it is impossible to install one of these new boilers.

New controls must be fitted to increase efficiency especially Thermostatic Control Valves (TRVs) to the radiators. It also demands that heating controls such as room thermostats, hot water thermostats and programmers are installed to minimise energy loss. This may mean extra work to your installation in addition to a straight new boiler exchange.

Part P of the building Regulations: As of the first of January 2005 new regulations came into force.

These regulations mean that only competent people can touch your electrical installation in your house. You can change a plug but that is about all.

Thus, We may need to have an electrician help us with an installation.

We maintain and service boilers: New boilers need annual servicing. They are much more complicated than traditional boilers. If they are not maintained properly this can lead to break downs. Boiler manufacturers all expect annual maintenance of their products.

Open Flued Boilers (boilers using Chimneys)

Changes to legislation mean that using open flues (Chimneys) are discouraged. The testing of these flues is much more rigorous and time consuming than testing balanced (through the wall flues). Please note if you have an open flue the new regulations may require more ventilation in the room where the boiler is located which will mean that vents will need to be made in the external walls.

Fanned Flues: A fanned flue is a pipe leading from the back of the boiler straight outside. These flues draw in air and expel the combustion flue gases from the same pipe (it has an inner and out tube). These are much easier to test when it comes to annual servicing. Older systems have balanced flues which are similar.

Gas Rating

Please note that only Corgi registered people can work on gas appliances. All gas appliances need to be registered with Corgi when they are changed or installed. This includes cookers, gas hobs and boilers.

There are strict rules about the amount of gas required for every appliance. If there is not enough gas available for the requirements of the appliance, then the appliance could be dangerous.

It is usually possible to do a rough calculation to establish whether there will be enough gas for the appliances that will be connected. However, this can never be definitive especially when pipes are concealed etc.

Unfortunately, it is impossible to test that the correct amount gas needed for the appliance to burn correctly without having the appliance connected.

If when the final commissioning checks are carried out and there is not enough gas, then the appliance fails. It will then require that the pipework be adapted or re-run so that enough gas is delivered to all the appliances working off that meter.

Re-running the gas piping to an existing appliance can lead to considerable disruption and cost.

How to look after your home central heating

It is very important to have a properly qualified gas safe engineer to look at your boiler every year.

It is also very important to vent the radiators to make sure no air has entered the system and to keep an eye on the pressure this should be on the green or around 1.2 bar of your pressure gauge. At the end of each winter go around all the thermostatic radiator valves and turn them all on.

You can then control the heating if you need it from the main room thermostat. This will mean that next winter none of the valves will stick.

Please phone us for any queries or help on 020 8964 6710.

How to stop cold spots in your radiators

Most cold spots on the bottom of radiators are caused by rust this can be reduced with continued maintenance by keeping your radiators vented and by putting special chemicals in the central heating side of your system.

A Magnaclean can be installed – this pulls out any rust in the system continuously. Each year when the boiler is serviced the engineer will then clean the magnaclean out. Thus it is constantly cleaning the system.

The system can also be power flushed. Harsh chemicals are added to the system then the radiators vibrated loosening lots of the rust. This process is then done to each of the radiators in turn until all of the floating debris has been removed.

This will remove the worst of it, but if systems have been left in poor condition for some years, it will not clear out all the cold spots.

Please phone us for any queries or help on 020 8964 6710.

Flushing your heating system

The system can also be power flushed. Special chemicals are added to the system then the radiators vibrated loosening lots of the rust. This process is then done to each of the radiators in turn until all of the floating debris has been removed.

This will remove the worst of it, but if the system has been left in poor condition for some years, it will not clear out all the old cold spots.

Please phone us for any queries or help on 020 8964 6710.

Heating Systems – sealed or vented?

Sealed systems have an expansion vessel that absorbs the pressure of the water in the system expands due to the heat in the system. Whereas open vented systems have an expansion pipe that lets out the pressure. Open vented systems are more prone to rust in the system.

Over time this will reduce the effectiveness of the radiators, and the boiler will need repairing. Chemicals can be added to the system to reduce this. However sealed systems are more efficient.

Sealed systems pros

  • Less rusting
  • Less likely to suck air into the system creating air locks and rust
  • If a radiator is damaged, only half a bucket of water will leak from the system.

Sealed system cons

  • When the pressure reduces, the boiled will stop working. (Regular servicing is needed)
  • A pipe must lead to outside for the pressure relief valve to dump the excess pressure when problems occur with the boiler

Open vented system pros

  • If the system is very old and has lots of small leaks, the pressure will never stop the boiler from working
  • If the system is very old, no excess pressure will be put on pipes and radiators creating leaks.

Open vented system cons

  • Less efficient
  • More rust in system
  • More space is taken up from the tank.

Please phone us for any queries or help on 020 8964 6710.

Things to consider when looking for a new boiler

Modern day boilers are much more efficient. However because when they start up, they use more gas (more of the heat is then transferred into your house, so the net loss is much more efficient) they need to have a 22 mm pipe supplying the gas.

This may be a problem, and the engineer might have to re-run some of the gas pipes from the gas meter to the boiler. Modern boilers use much more of the heat created from the gas being burned. Therefore the flue gasses are considerably less hot than in the older models.

This, in turn, means that the flue gasses have much more noticeable moisture content contained within. In practical terms modern condensing boilers, plume. You can see this on a cold day boiler flues pumping out clouds of condensation. As well as this, a condensation pipe must be fitted to the boiler to take more unwanted water away. This pipe must be able to drain away.

It can be pumped if necessary. Modern day systems can be sealed or have small water tanks, and there are pros and cons to both systems. But a sealed system must have a pressure release valve.

It is also very important to have the system flushed out before the new boiler is installed.

Please phone us for any queries or help on 020 8964 6710.

Boiler Breakdowns

There are a number of simple things that go wrong with boilers that you can fix without calling out a heating engineer.

You must make sure that you have the instruction/user manual for your boiler and the programmer/room thermostat. These are specifically designed to help you look after your boiler and central heating system. Read more.

How to tell if it’s time to replace your boiler

The make and model of your boiler will obviously depend on the durability of the appliance.  This will also depend on the sight of the original installation.  However, new boilers are much more cost effective and better for the environment than older models.

What you don’t want is in the middle of winter being left without heating or hot water.  So it is very important to get your boiler serviced every year.

The professional engineer that you get in will be the best informed to help you make decisions and inform you of your options, advise you if you need to install a new boiler or get the existing boiler repaired.

Please phone us for any queries or help on 020 8964 6710.

Boiler problems – what to look out for and when to contact a plumber

You should have your boiler serviced every year buy a fully qualified gas safe engineer. This is really important.

Watch out for small puddles of water around radiators or under sinks. It might be just a coincidence or the laundry drying. However, call your plumber out or at least give him a ring.

Plumbers are nice people, and most will be more than happy to give you some advice over the phone. In the long run, it will be cheaper as redecoration is timely, expensive and annoying!

Please phone us for any queries or help on 020 8964 6710.