If you are thinking about a boiler upgrade in Surrey, you are not alone. We speak to homeowners in Addlestone and the surrounding areas every week who are weighing up whether to stick with their regular boiler or move to a combi.
For many, it starts with a simple problem. The hot water runs out halfway through the last shower. The airing cupboard is crammed with tanks. Or the system is simply ageing and unreliable. Converting from a regular boiler to a combi boiler can make a real difference, but it is not a one size fits all decision. Here is what you need to know.
What Is a Regular Boiler?
A regular boiler, sometimes called a conventional or heat only boiler, works alongside a cold water storage tank in the loft and a hot water cylinder, often in the airing cupboard.
Water is stored and heated in the cylinder, ready for when you turn on a tap or run a bath. Once the stored hot water is used up, you have to wait for it to reheat.
These systems have been common in larger houses for decades. They are reliable and can cope well with multiple bathrooms in use at the same time, provided the cylinder is sized correctly. However, they do take up space and involve more pipework and components that can eventually wear out.
What Is a Combi Boiler and How Does It Work?
A combi boiler, short for combination boiler, heats water directly from the mains as and when you need it. There is no separate hot water cylinder and no cold water tank in the loft.
When you open a hot tap, the boiler fires up and delivers hot water on demand. When the tap is turned off, it stops. The same appliance also provides heating to your radiators.
Because everything is contained within one unit, combi boilers are compact. We often install them in kitchen cupboards in terrace houses around Chertsey or in utility rooms in Walton where space is tight and homeowners want to free up the airing cupboard for storage.
Key Benefits of Converting from a Regular Boiler to a Combi Boiler
Homeowners usually consider a conversion for a mix of practical and financial reasons.
More Space
Removing the hot water cylinder and loft tank gives you usable space. In smaller homes in Staines or Ashford, that extra cupboard can make a big difference. In some cases, clients turn the old airing cupboard into shelving or even a compact home office nook.
Hot Water on Demand
With a combi, you are not limited by how much hot water is stored. As long as the mains pressure is good, you can have continuous hot water without worrying about it running out.
Improved Efficiency
Modern combi boilers are highly efficient. There is no need to keep a tank of water hot all day, which can reduce wasted energy. For landlords in Egham looking to improve EPC ratings, this can be a strong selling point.
Less Pipework and Fewer Components
No loft tank means fewer parts to maintain. We regularly attend callouts where old ball valves stick or overflow pipes start dripping. Removing those elements can simplify the system.
Is Your Property Suitable for a Combi Boiler?
This is the key question and one we always assess carefully.
Combi boilers rely on good mains water pressure and flow rate. In most parts of Surrey, especially around Shepperton and Walton-on-Thames, mains pressure tends to be decent. However, we always test it before recommending a conversion.
You should also consider:
- How many bathrooms are in the property
- Whether you often run multiple showers at once
- The size of the property and heating demand
- The condition of your existing pipework and radiators
In larger homes with three or more bathrooms, a combi may struggle if several outlets are used simultaneously. In those cases, a system boiler with an unvented cylinder might be the better option.
A proper survey helps avoid disappointment later. It is not just about swapping the box on the wall.
Costs Involved in a Boiler Conversion
One of the first questions we are asked is, how much does it cost?
Converting from a regular boiler to a combi is more involved than a straightforward like for like replacement. The process usually includes:
- Removing the old boiler
- Draining and removing the hot water cylinder
- Removing or decommissioning the loft tank
- Altering pipework
- Upgrading controls and possibly the gas supply
As a very general guide, a full conversion can cost more than a simple boiler swap because of the additional labour and materials involved. The exact figure depends on access, property layout and whether other upgrades are needed, such as new radiators or a magnetic filter.
We always provide a detailed written quote so you can see exactly what is included.
The Installation Process Explained
Many homeowners worry that a conversion will be hugely disruptive. In reality, most projects are completed within a few days.
First, we protect flooring and work areas. The old system is drained down and the boiler, cylinder and tanks are removed. Pipework is altered to create a sealed system suitable for a combi boiler.
The new boiler is installed, connected to the gas and water supplies and flue, then thoroughly tested. We flush the system if required to remove sludge. Finally, we set up the controls and show you how everything works.
Before we leave, we register the boiler with Gas Safe and the manufacturer for warranty purposes. We also take the time to answer the practical questions people often forget to ask, such as how to top up pressure or set the timer properly.
Why Choose RJG Heating and Plumbing Ltd?
Choosing the right installer is just as important as choosing the right boiler.
When converting from a regular boiler to a combi boiler, details matter. Things like correct boiler sizing, checking gas pipe capacity and ensuring the condensate pipe is routed safely can affect performance and lifespan.
We take the time to carry out a proper survey and give honest advice. If a combi is not the best option for your property, we will tell you. Much of our work comes from word of mouth across Surrey, and that only happens when customers feel they have been treated fairly.
If you are in Shepperton, Staines, Walton-on-Thames, Egham, Chertsey, Addlestone, Ashford or the surrounding areas and are thinking about converting from a regular boiler to a combi boiler, local knowledge makes a difference. RJG Heating and Plumbing Ltd understands the mix of property types in these areas, from 1930s semis to modern flats, and can guide you through the options with clear, practical advice.
Contact RJG Heating and Plumbing Ltd for a free boiler upgrade quote.