Should I repair or replace my boiler?

We won’t recommend replacing a boiler unnecessarily but a brand-new boiler is going to be much more efficient and more reliable which will save you money in the longer term.

If a boiler is beyond repair or it is an older model that is no longer financially viable to maintain then there is little choice but to replace it.

Your new boiler will be covered by warranty too – so if it breaks, the manufacturer will repair it with no extra charge.

We can supply and fit a brand-new A-rated boiler from as little as £999, including VAT.

What is the process if I decide to upgrade my boiler?

You are in control. We can either visit you at home to assess your requirements and talk through your options.

Or, instead of bothering you at home, we get you to answer a few simple questions with a quick questionnaire we’ll send to you via email.


Or, we do it over the phone at a time convenient to you. It’s easy to do and will only take a few minutes of your time, we just need to know some basics about your existing set up.

You can then choose your preferred new boiler armed with our recommendations, saving you up to £££’s in the process.

We require a 20% deposit of the total cost and upon receipt of your deposit you can choose a convenient available date to have one of our Gas Safe Engineers install and commission your new A-rated boiler for you.

How much does a new boiler cost?

The costs for a brand-new A-rated boiler, a brand-new flue, all the right fixtures, fittings and safety attachments, plus installation from a Gas Safe Registered Engineer would typically set you back between £2,500 and £4,000.

FlowSafe can offer you exactly the same A-rated boiler, flue, attachments and Gas Safe registered installation from £999 including VAT.

Will I get boiler cover from FlowSafe?


Every new boiler comes with a manufacturer’s guarantee of up to 10 years.

You don’t need to do anything to activate your guarantee – we’ll register your boiler with the manufacturer as part of our installation service.

Are FlowSafe installers trained and Gas Safe Registered?


All of our installers are professional, experienced central heating engineers with Gas Safe certification. You can check this on the Gas Safe website prior and our engineer will carry a Gas Safe ID badge.

Will the installation make a mess?


Our engineers will make sure that routes through your home (carpets/flooring) and all surfaces are properly protected and the area they’re working in is always clean and tidy.

Will FlowSafe flush the system as part of the installation?


We’ll start with a cold open flush & agitator direct to an outside drain, keeping the new boiler isolated and protected from the existing radiators and associated pipework.

If you have opted to have a magnetic filter fitted we can chemically flush & agitate the system at temperature too.

We’ll put a cleaner into your system, flushing it around using the boiler whilst agitating the radiators. Any debris will be caught by the magnetic filter we install which is designed to be removed and cleaned. We’ll keep going until it’s clean, then it can be drained and refilled with clean water. Finally, an inhibitor is added to the water to protect the system.

Will FlowSafe do a power flush?


There are a couple of types of flush and different reasons for doing them. If we assess that your system requires one we will need to schedule that as a separate job, prior to fitting your new boiler. Our engineers will advise you accordingly.

Do I need to do anything before my installer arrives?


Before your installer arrives, clear the areas of any belongings around the boiler, gas meter and water stopcock (normally under the kitchen sink) so the engineer can access those areas easily.

It’s also a good idea to make sure everyone has finished in the bathroom well before the engineer arrives as the water will need to be turned off temporarily. You may want to fill the kettle for the same reason.

Will FlowSafe take away my old boiler?

Yes. We will always take away your old boiler unless you tell us not to. If you don’t want us to remove your old boiler, let your installer know on the day of installation.

Can you install if I live above the second floor?

In most cases no as there’s a huge cost for hiring specialist equipment that lets our engineers reach the outside of your home, and we don’t want to have to pass that cost on to you.

If you want to talk through your options, ring us on 07515 21 21 21 or email

What is a Combi boiler?

Combi boilers, or Combination boilers, are the most popular type of boiler in the UK. They’re used by around 75% of households.

They’re named ‘Combination’ because they combine a high-efficiency water heater and a central heating boiler all in one unit.

Combi boilers are efficient and cost less in heating bills.

That’s because:

  • They only heat water when you need it, rather than storing hot water up
  • They’re small and compact, as they don’t use an external hot water tank

What is a system boiler?

System boilers heat your radiators directly and store hot water in a storage cylinder. They’re usually installed in an airing cupboard or garage. They heat a large volume of water and then store it until you use it. This means they’re less efficient than Combi boilers, which heat water only when you use it.

What is a standard boiler?

Standard boilers are also known as Conventional or Regular boilers. They store hot water in a storage cylinder, like System boilers, but they’re fed by a separate cold-water tank (usually in the loft). There’s another separate tank, called a ‘feed and expansion cistern’, usually in the loft too. Standard boilers are the largest type of boiler.

What is an ErP label?

The Erp (Energy related products) label tells you how efficiently a boiler (or another appliance like a fridge or a washing machine) uses energy. It’s designed to help you choose the right appliance and pay less in energy bills. The label rates products from A+++ to G.

A+++ is the most efficient boiler you can get.

It also tells you how loud the appliance is in decibels and how much heat it outputs in kilowatts.

All of the boilers FlowSafe recommend are rated A for efficiency.

What are Thermostatic Radiator Valves?

Thermostatic Radiator Valves (TRV’s) are controls for your radiators. They regulate how much hot water flows into the radiator so you can adjust its temperature.

TRV’s also let you turn some radiators off (for example, in a room you’re not using) without turning off the heating.

Why do I need TRVs?

The Government recommends that every household has Thermostatic Radiator Valves because they:

  • save you money on heating bills
  • use less energy
  • are better for the environment

They’re not mandatory but we highly recommend you install them in conjunction with your new boiler.

What’s the extra cost?

Costs vary depending on type and of course how many you need, but the initial outlay is worth it when you consider they use 37% less energy to heat your home, making a noticeable difference to your annual heating bills.

We’ll provide a quote upon request to have us install them for you.

What is a flue?

A flue is a pipe, like a chimney, that carries products of combustion from the boiler direct to the outside. You can see your flue exit (the part of the flue that comes out of your house) on the wall or roof of your home.

Flues can either be square or round in shape.

If the flue is less than two metres off the ground, or underneath a carport or shelter, it’ll be covered by a guard. This looks like a piece of wire mesh covering the end of the flue.

When you buy a new boiler from FlowSafe, we’ll supply and fit a brand-new flue for you, along with all the safety attachments you need at no extra cost (terms & conditions apply).

Will my old boiler be recycled?

Yes. Many parts of your old boiler can be recycled. FlowSafe supports recycling as much of your old boiler as possible.

What’s a plume management kit?

A Plume Management Kit directs ‘products of combustion’ away from openings or vents into your property. This keeps you and your family safe.

What’s a magnetic filter?

A magnetic filter is fitted to the boiler on the return flow pipe. This catches any debris from your system and stops it getting into your new boiler.