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Combination Boiler Costs & Quotes - 2021 Guide


UK combi boiler costs guide for 2021

So what are combi boilers?


A combi boiler is a combination of a regular and a system boiler. It has the same features as a regular boiler but with added secondary functions from its ‘system’ title. Basically, this means that you can use your combi boiler for central heating (as your main heat source), hot water and domestic hot water (as well as topping up). So, if you’re looking for more home comfort and looking to reduce your bills, then got for a combi.

A combi boiler works independently of the mains hot water supply and heats the water only as it is drawn from it. As a result, you can enjoy full central heating and hot water for your taps at all times, without any reliance on the central heat.

Combi boilers are also more compact than conventional boilers due to their integrated hot water tank, and offer a greater efficiency of up to 80 per cent. They’re also cheaper to run, with a minimum annual running cost of around £85. That said, they are more sophisticated than conventional radiators (and typically range in cost between £1000 and £3000), while the mains supply of hot water is simply a pump extracting from any domestic hot water cylinder.

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What is a condensing combi boiler?


When deciding what kind of new boiler you want to buy, one of the key considerations is whether you should go for a condensing boiler or not. If you only care about saving on gas and electricity, it’s clear that condensing boilers will save you money. But there are also other benefits to going for a properly installed condensing boiler that make it a much more energy efficient and easier option all round.

A condensing boiler has undergone a fundamental change in its design, which works to make it more efficient and environmentally friendly. They still have the same purpose as a regular boiler: providing hot water on demand and heating your home. But condensing boilers are a lot different from their predecessors.

How do they work?

The main difference is that they don’t release some of their exhaust into the air, instead recycling it back into the system.

A condensing boiler is one that removes the majority of waste heat from the flue gases before these are discharged to the atmosphere through an exhaust flue pipe. This means that a significant percentage of the heat in the flue gases is recovered and fed back into the boiler water to heat up this water in order to make more steam. Condensing technology with modern boilers means that around 95% of the waste heat from flue gases produced is recovered, making them highly efficient and giving them a low carbon footprint.

Available Types of Combi Boiler to Buy


There are a wide range of combi boiler prices on the market, so it’s important to do your research when choosing one for your home. There are many factors to decide on before you buy, such as the size, brands and price. But combi boilers also come in different types, so it’s important to understand what these different types are and what they can offer. The most popular type of combi boiler is the gas combi boiler, because its higher efficiency means you can heat your home for less money – ideal if you’re on a budget.

Gas

Natural gas combi boilers, also known as condensing boilers, are the most common type of boiler installed in homes for several reasons. These boilers, which can heat water and central heating radiators at the same time, don’t require any specialist work to install unlike other types such as oil fired models. Natural gas is a cheaper fuel than oil so they are also more cost effective to operate.

LPG

These are warm-air boilers and offer both hot water and central heating. They can be fitted to provide domestic hot water, central heating only or a combination of the two. The combination boilers, which make up about 75% of the market, use an electric heating element to boost the flow rate of hot water for faster electrical showers.

LPG is the cryogenic liquid at normal temperature. Natural gas, hydrocarbons are gaseous at normal temperature, but when they are cooled to about −161 degrees Celsius in liquid state, so called liquefied form or LPG can be stored for long time. Unlike natural gas or propane, butane and propylene are light, non-toxic and easily stored for later use in special tanks designed for this purpose.

Electric

Electric combi boilers are small, unobtrusive systems that heat your water using electric elements to provide instant hot water on demand. The thermostat turns the element on when necessary and turns it off again when it is not needed, so electric combi boilers use less energy than traditional boiler systems.

Electric combi boilers are usually used in smaller properties where the demand for hot water is less; however, they can be used in larger properties as a way of providing non-central heating. The system can provide both hot water and heat to radiators or under floor heating systems.

Many electric combi boilers are highly energy efficient and can lower your energy bills significantly. If you’re a landlord who is thinking about buying an electric combi boiler, you could potentially use the savings to invest in other parts of your rental property. This way, the investment will pay for itself over time.

Oil

The oil combi boiler is a popular choice for homes in the UK that aren’t connected to the gas network. These boilers are both cheap and extremely efficient as well as being used as part of an eco-friendly system if you’re interested in that sort of thing. The systems have been around for many years and have long been used to heat large buildings such as schools and hospitals.

Many homeowners are turning to an oil combi boiler system as a way of reducing their upfront costs. Instead of paying for gas and electric hook-ups, an oil combi boiler is fitted to an outside oil tank which feeds both your heating and hot water systems.

Oil combi boiler systems can either be used for heating your home and hot water supply or for just supplying heat to each room in your house.

What are the advantages of a combi boiler?


Compact dimensions - easily hidden

Most modern homes are smaller than ever, with larger families and space at a premium, compact combi boilers are perfect. Due to their size they are able to save on space in your home, leaving you more room for the things that matter.

The majority of large combi boilers with hot water storage tanks and separate heating zones require a standard amount of space to install. However, compact size combi boilers are smaller units designed to fit inside kitchen cabinets, storage rooms, utility rooms and en-suite bathrooms.

Not only do these compact units reduce the amount of ugly pipework leading from your living room into the hallway or garage, but you also get that familiar domestic warmth as soon as you walk through the front door.

Instant hot water on demand

If you need hot water on demand, combi boilers are the way to go. They can be used to provide both central heating and hot water. Within minutes of switching them on, you can have hot water for washing up. As the name suggests, they combine two different elements: a high efficiency boiler and a tankless instantaneous water heater. Combis don’t keep a large storage tank of hot water like conventional gas or electric storage boilers do - instead they use an instantaneous water heater (or ‘electronic ignition’ as it’s also known). This heats up the water as soon as it is needed.

Efficient energy

High energy efficiency isn’t a choice, it’s a legal obligation. An energy-efficient boiler upgrade can cut your home’s carbon emissions by 30%, make winter cheaper and more comfortable, and safeguard you from price hikes with your existing boiler in the future.

The government has recently made a brand new high energy efficiency ruling for 2018/2019, stating that all new combi boilers in the UK will be legally required to be at least 92% efficient. This is the highest level of efficiency on the market meaning only 8% of the fuel the boiler uses is wasted. That’s means reduced home heating costs and a lower carbon footprint for you.

Simple to install - loved by engineers

Combi boilers are easy to install. They have been designed to be as straight forward as possible so that any installer should be able to install them with minimum amount of fuss. In fact, the entire unit can be installed in just one day. They are renowned for their simplicity, which means a combi boiler is easy to install for a suitably qualified engineer.

Reduced energy bills - more efficiency = more savings

A good boiler installation is one of the best ways to lower your energy bills. Energy-efficient condensing boilers do exactly what they claim on the tin and more. If you combine one of the latest high efficiency condensing boilers with an efficient heating system, like underfloor heating, then the savings make for even more appealing reading.

The energy efficiency of this type of boiler is normally between 92-98%, compared to just 70-90% for your old system. This means that 92% of the gas or oil you use is turned into heat, and only 8% is lost in other areas such as exhaust emissions and heat loss through the system.

Increased water pressure from mains

Unlike traditional systems, which rely on gravity from a tank in the loft, combi boilers take their water supply directly from the mains - giving you a much stronger flow of hot water. A combi boiler also uses a pump to increase the water pressure, and this delivers much better hot-water flow throughout your home.

Considerations when choosing a combi boiler


You need decent mains pressure

If you’re in the process of installing a combi boiler in your home, there’s one essential thing to consider before switching to the new system — your existing plumbing. If the water pressure in your home is low or inconsistent it might be due to weak mains pressure, and this is something that can have an influence on the effectiveness of a combi boiler. For a boiler system to operate effectively, you’ll ideally need to have a steady flow of water from the mains supply — enough to run taps and showers at the same time as other appliances without risk of pressure dropping.

It's recommended that the flow rate through mains pipework should be 3.2-4 litres per second (minimum). This can be checked with a flowmeter which can be bought from most DIY stores. Mains pressure is only as good as the weakest link in the chain so if there is a problem it will likely show in reduced flow through your taps in the kitchen or bathroom. You may even find you have pressure dropping off when trying to take a shower.

Your old pipework may not be compatible

If you’re replacing an old heating system with a combi boiler then the good news is that the existing pipework and radiators should be compatible. The latest boilers will all feature an integral feed tank in the boiler to deliver hot water, which means it will be compatible with most existing pipework and radiators.

An incompatibility between mains pressure and old pipework and radiators can also occur when you replace a large old boiler with a smaller new one, as there will be less capacity in the system.

It is therefore essential to ensure all old pipework, including in the loft, has a good flow and would not be damaged by mains pressure.

Larger homes will need a bigger boiler

If you are looking for an eco-friendly, quiet, quick to install and low cost solution, combi boilers are a great option. However if you have a large family with an assortment of sinks, baths and showers then a combi boiler may not be the best solution. It’s likely that if it needs to meet the demand of several outlets at once it will have to split up its flow. This means that if your kitchen is hot and your shower is cold, turning them both on at the same time won’t be enough to allow them both to run at a high pressure. In this case could be better to take a look at conventional or system boilers which store hot water and can suppy multiple outlets at once.

Combi boiler size guide


What size combi boiler do I need? It’s a question we are asked regularly by homeowners looking to replace an old boiler or install one for the first time. Have you ever wondered what size boiler you need for your home? Do you know how you can work out exactly what output of boiler is needed for your property?

There are two aspects to the size of the combi boiler - one is the actual size or output in kilowatts (kW) which controls how many radiators it can heat at once. The second aspect is the capacity in litres, and this is what determines how much hot water it can produce at once.

Here's a handy table to help explain typical outputs per household size:

Bedrooms Bathrooms Minimum kW
2 1 26kW
2 2 29kW
3 1 29kW
3 2 35kW
4 1 29kW
4 2 35kW
5 1 35kW
5 2 35kW

Having enough hot water when you need it is a must in any home, particularly if there are more than one taps or showers that need to be kept filled. If you are in a large household or have children who like showers and baths it’s a good idea to consider how much hot water you will need and choose a boiler accordingly.

New combi boiler prices


Boiler prices tend to vary depending on the type of boiler you choose but with a combi boiler the price begins around £500. Boiler prices for a combi are slightly cheaper than other types of boiler because they can also be used as a hot water system rather than only being used for heating your home.

The cheapest combi boilers cost around £500, but you can expect to pay between £500 and £1,500 for install and the boiler. These are just an average price!

Here are few examples from popular brands:

Model kW ErP Warranty Price
BAXI 600 636 36kW 36
A Heat
A Water
7 £1033.14
BAXI 200 228 28kW 28
A Heat
A Water
3 £601.44
BAXI 800 830 30
A Heat
A Water
10 £996.57
BAXI Platinum 33 33
A Heat
A Water
10 £1108.87
BAXI 400 428 28kW 28
A Heat
A Water
5 £708.64
BAXI Duo-tec 24 24
A Heat
A Water
7 £777.92
BAXI 800 825 25
A Heat
A Water
10 £893.65
BAXI Platinum 40 40
A Heat
A Water
10 £1223.9
BAXI 200 224 24kW 24
A Heat
A Water
3 £587.2
BAXI EcoBlue Advance 33 33
A Heat
A Water
10 £1474.13
BAXI Platinum 28 28
A Heat
A Water
10 £981.74
BAXI Platinum 24 24
A Heat
A Water
10 £905.05
BAXI Platinum+ 40kW 40
A Heat
A Water
5 £1374.24
Ferroli Bluehelix Tech 28C 24
A Heat
A Water
10 £743.05
Ferroli Bluehelix Tech 34C 30
A Heat
A Water
10 £812.71
Ferroli Bluehelix Tech 24C 20
A Heat
A Water
10 £692.11
Glow-worm Energy2 30c 30
A Heat
A Water
2 £993.87
Heatline Capriz2 28kW 28
A Heat
A Water
2 £543.64
Heatline Capriz2 24kW 24
A Heat
A Water
2 £507.32
Ideal Exclusive 2 35kW 35
A Heat
A Water
5 £689.3
Ideal Logic Max C30 30.3
A Heat
A Water
10 £1020.58
Ideal Vogue Max C40 40
A Heat
A Water
10 £1400.25
Ideal Vogue C40 GEN2 40
A Heat
A Water
8 £1274.11
Ideal Logic+ C35 35.3
A Heat
A Water
7 £1098.78
Ideal Logic Max C24 24
A Heat
A Water
10 £944.4
Ideal Logic Max C35 35.3
A Heat
A Water
10 £1159.16
Ideal Logic Code ESP1 33kW 33
A Heat
A Water
2 £1392.13
Ideal Logic ESP1 30kW 30
A Heat
A Water
2 £905.6
Ideal Vogue Max C32 32
A Heat
A Water
10 £1274.73
Keston 30 30
A Heat
A Water
5 £1245.11
Keston 35 Combination Boiler 35
A Heat
A Water
5 £1393.77
Potterton Assure 36kW 36
A Heat
A Water
2 £1094.74
Vaillant ecoFIT pure 835 35
A Heat
A Water
2 £1208.76
Vaillant ecoTEC 835 exclusive Green iQ 35
A Heat
A Water
5 £1532.46
Vaillant ecoTEC 843 exclusive Green iQ 43
A Heat
A Water
5 £1784.77
Viessmann Vitodens 200-W 32/35kW 32
Heat
Water
3 £1732.66
Viessmann Vitodens 200-W 25/30kW 25
Heat
Water
3 £1673.34
Viessmann Vitodens 050-W 29kW 29
A Heat
A Water
3 £807.13
Worcester Bosch Greenstar 8000 Style 40kW 40
A Heat
A Water
8 £1614.91
Worcester Bosch Greenstar 2000 25kW 25
A Heat
A Water
5 £782.31
Worcester Bosch Greenstar Highflow 550CDi 30
A Heat
B Water
7 £2486.4
Worcester Bosch Greenstar 25i 25
A Heat
A Water
5 £1045.03

It's important to remember that these prices include VAT, however exclude installation costs which will need to be factored in to the total price. It's simple to receive free quotes for any boiler installation by clicking here.

Saving on combi boiler costs

Many of us buy a boiler when we move into our first home and replace the old one, some of us have a boiler installed at a new or renovated property. Some of us will have bought our boiler 10 years ago and will now be looking to replace it.  Whatever the situation you find yourself in, buying a boiler can be an important investment. This is not only because it's an expensive purchase but because you'll be relying on it for your heating and hot water needs for many years to come. All things considered, would you ever go out and buy something as valuable as a boiler without doing your research first?

If you’re in the market for a boiler and boiler installation, you’ve probably noticed that prices can vary dramatically. I know from experience that it can be confusing to know which model to purchase and who to choose as your installer since there are so many options available.

If you’re in a position to invest, you should try to spend as much as you can afford to and choose a high quality model with a substantial warranty.

When choosing a boiler, people very often have only their budget to consider. The cheaper the better! However, cheap boilers don’t always offer the best efficiency or quality and are not intended for those who live in the house all year around -- just for holiday homes. But there are several manufacturers which offer reliable and efficient but also relatively cheap boilers. If you are looking for a cheap boiler which doesn’t compromise on quality, take a look at combi boilers by Glow-worm, Vokera and Ideal.

How much does combi boiler installation cost?


When it comes to installing a new combi boiler, the overall cost is impacted by lots of factors. There are two main costs to consider when installing a combi boiler; these include the unit itself and the installation costs. Following this, there will be other minor costs such as plumbing fees, which will be determined by the length of piping required as well as the transformer cost which impacts whether you require an electrician or not.

These days, installation costs can vary quite a lot. £500 could get you a small job, or £700 could get you a major overhaul on your heating system. We’d recommend finding out what the average price is in your area before starting any project – you don’t want to upset the budget!

The total price depends on circumstances, but usually the total combi boiler cost in a typical house will be between £2000 and £3000. The reason for this big range is due to many factors, such as the size of your home, length of piping required, choice of barrel and whether or not you need to have an electrician.

Its worth noting that all condensing boilers (whether combi, system or regular) require a condensing pipe to drain the condensed vapour and dispose of it down a drain. If this needs to be relocated then that in turn will add to the overall cost.

Free Combi Boiler Quotes


If you look at the range of combi boilers you can buy, it can seem overwhelming with a huge choice of products available. Some brands sell multiple combi boiler ranges, and some even sell a combination boiler to suit every requirement. So how do you choose?

We’ve taken the stress out of combi boiler research. You can receive up to four free quotes from local, trusted boiler engineers for all combination boiler installation by simply completing our online form today.

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