Whether for a new build or a modernisation project, Viessmann offers gas heating systems, gas boilers and gas hybrid heating systems for owner-occupied apartments, detached houses and major housing developments. Use of the latest technologies ensures a wide range of needs can be met whilst also offering convenient heating with either natural gas or LPG.
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Viessmann gas heating systems are noted for their extremely compact design and highly efficient operation utilising condensing technology. It is no accident that gas heating is the most commonly installed heating system in Germany in detached homes, two-family houses and apartment buildings (accounting for 49.3 percent of systems) and in apartments (48.2 percent). This means that just under half of all heat generators in use here run on natural gas, according to the results of the study "Wie heizt Deutschland ?" [German Heating System Survey ] conducted by the Federal Association for Energy and Water Management (BDEW).
Owners of detached homes, two-family houses and small apartment buildings in particular benefit from the wide portfolio of products that Viessmann offers in the residential buildings sector. Regardless of whether they opt for a compact condensing appliance in the form of a wall mounted gas boiler or a floorstanding gas boiler with solar indirect coil: with rated heating outputs of up to 80 kW, Viessmann gas heating systems can meet heating and heat demands efficiently and reliably at all times.
Detailed information on gas condensing boilers is provided in the section on gas heating with condensing technology. Anyone interested in the proven conventional heating technology for the 405 to kW output range will find all the important information in the section on low temperature gas boilers.
All Viessmann gas heating systems meet EU-wide requirements for efficient condensing technology. Up to 98 percent of the energy used is converted into heat. With such unbeatably high levels of efficiency, everyone who uses a gas condensing boiler is making a positive contribution to protecting the climate and the environment. By comparison, most heating systems without condensing technology, for example low temperature gas boilers, manage about 87 percent under the same conditions. Innovative technology, such as the new gas adsorption heating appliance, reduces gas consumption by around 25 percent compared to conventional condensing technology. This saves fuel, reduces emissions still further and makes heating with a gas boiler even more efficient.
Are you looking for a new boiler to provide a reliable supply of hot water to your central heating system and water outlets?
Silly question, of course, you are, who isn't?
There are three main types of central heating boilers available: combi boilers, system boilers and regular boilers.
The exact type of boiler you require depends on a variety of different factors including the size and type of property you have, your hot water demands, the age of your system, as well as the pressure of your mains water supply.
So what type of central heating boiler is right for your home? In this guide, we&#;ll explore the pros and cons of each and help you make an informed decision.
Let's dive in...
By far the most common type of central heating boiler installed in the UK is the combination boiler (or, combi boiler for short).
Combi boilers provide both hot water and central heating water from a single unit. This is typically wall-hung.
They're the heating dream...
Coldwater is taken directly from the mains water supply and heated by the heat exchanger within the boiler unit.
A combi boiler&#;s heat is produced through the combustion or burning of fossil fuels i.e. natural gas and oil.
They do not require a separate hot water storage tank or a cold water tank in the attic. Instead, the hot water is provided by the unit itself, meaning that they are a great way to save space.
Learn all about combi boilers in our what is a combi boiler guide and refer to our review of the best combi boilers for a comprehensive exploration.
Got a central heating boiler in a tight spot? Go for the Worcester Bosch CDi Compact.
The compact design makes them ideal for properties with limited space.
Do not need a hot water storage cylinder.
Do not need a cold-water tank.
Hot water on demand.
High efficiency.
Straightforward installation.
Can rely on mains water pressure.
Typically, not suitable for larger properties with multiple bathrooms/or a high hot water demand
May not be suitable for areas that suffer from low mains water pressure
Heat only or regular boilers are one of the oldest types of boilers and are composed of three main parts - the boiler unit, a hot water storage tank and a cold water storage tank.
They provide both hot water to the central heating system and the storage cylinder, so are able to provide both hot water and heating water.
The cold water storage tank is filled with cold water from the mains which is then fed into the hot water storage cylinder.
From there, it is then heated and stored ready to be used by the central heating system or delivered to hot water outlets.
Good choice for properties with multiple bathrooms and high hot water demands
Ideal for areas that suffer from low water pressure
Good choice for those with older/traditional heating systems that cannot tolerate high pressure
Compatible with solar panels
Can be fitted with an immersion heater
Since they require a cistern tank, they demand more space and limit boiler installation options.
A cistern in the attic is prone to freezing during winter and if it leaks can be problematic.
Water pressure can be low since it relies on gravity.
Installation is more complex.
Hot water is limited since it can only use as much as the storage tank can store.
System boilers are essentially an updated version of the regular boiler and are somewhere between the combi and the regular boiler.
The majority of components are internalised, making installation options more flexible, for example, all parts such as the pump and expansion vessel are internal too, which also means it does not require a cold-water cistern tank and water is supplied to the boiler via the mains.
System boilers still require a hot water storage cylinder. They can provide both hot water on demand and heating water for your radiators.
Recommended for properties with multiple bathrooms/hot water outlets - since water pressure loss is limited.
Does not require a cistern tank in the loft.
Internal components make installation easier.
Compatible with solar thermal.
Uses mains water pressure.
May not be suitable for areas that suffer from low water pressure.
May not be suitable for older central heating systems that cannot tolerate high water pressures.
If you are swapping from a combi, you need to consider where you will store the hot water tank.
Requires a hot water storage tank, so is not ideal for those with limited space.
Once all hot water within the tank has been used, you have to wait for more water to be heated.
When on the hunt for a new central heating boiler, you may come across the term condensing boiler and non-condensing boiler.
No matter what type of boiler you are thinking of having installed, the law says that it must be a condensing one and so today there is no use in worrying about these terms, since all modern boilers are condensing.
Condensing isn't a 'type of boiler' as such, it's more of a technical attribute
All condensing central heating boilers are at least 90% energy efficient, can harness excess energy to heat your home, are better for the environment and will help to reduce your heating bills.
For context, when you spend £1 on fuel only 10p is wasted, compared to older non-condensing boilers, which were around 70% efficient, this can make a substantial impact on your energy bills.
Contact us to discuss your requirements of Wall Mounted Condensing Gas Boiler. Our experienced sales team can help you identify the options that best suit your needs.
Whatever type of central heating boiler you are looking at, they will require some form of fuel to generate heat energy. The type of fuel you use will depend on a variety of factors including whether your home is on-grid or off-grid.
The majority of UK homes are connected to a gas supply via the national network, making a gas boiler an ideal choice for convenience and reliability.
Per kilowatt hour (kWh) for gas is significantly cheaper than electricity, making it much more financially viable for most households. Although gas boilers are not 100% efficient and electric heating is, it is still cheaper to heat your home with gas.
Gas boilers are not 100% efficient and produce carbon emissions.
Oil fuel is one of the most popular fuels for off-grid homes. It needs to be stored near your property in a storage tank and has to be refilled regularly.
For those not connected to the network, oil fuel is one of the most reliable and financially viable alternative fuels that have a high heat output.
Oil fuel is not available on demand like those fuels available on the grid e.g. gas and electricity.
It also needs to be ordered and stored in a large tank kept close to your property. This also means you have to keep an eye on how much fuel you have remaining.
Upfront costs for the storage tank can be substantial and since oil is highly flammable, it&#;s considered a hazard.
With electric boilers, you have the option of powering them via the network or off-grid by using solar panels.
Electric boilers are a good option for small properties with limited space and heating requirements since they are compact. They are also a great option for homes not connected to the gas network.
An electric boiler itself is much more efficient than gas boilers, meaning the fuel used is converted to heat and not wasted in the environment. Yet, this does not mean they are more environmentally friendly.
Electric boilers are much easier to install than gas since they do not require the installation of a flue and do not require a Gas Safe Engineer. Moreover, they do not rely on the combustion of fuel, so do not produce dangerous gases, such as carbon monoxide, so there is no risk of a hazardous leak.
Related heating/energy guides:
Although highly efficient appliances, electric boilers are not inexpensive to run due to the high cost of electricity. For context, as of , gas is currently half the price of electricity per kilowatt hour.
Electric boilers are not efficient for heating up water and so if your property has considerable water demands e.g. if your property is large and has multiple water outlets it may not be appropriate.
LPG or liquefied petroleum gas boilers use a mixture of hydrocarbon gases produced during the oil extraction and refining process. It is stored and transported in gas canisters.
LPG boilers are very cheap to purchase, especially in comparison to oil boilers and gas boilers, being more than half the cost on average.
Although LPG is a fossil fuel and is not carbon-free, it is significantly less polluting than oil, producing up to 20% less carbon. In comparison to oil boilers, they are significantly smaller, making them ideal for homes with limited space.
LPG is significantly more costly per kilowatt hour than both oil and gas. Since it&#;s not connected to a supply line, the fuel level has to be constantly monitored and a new tank reordered before all the fuel runs out.
LPG gas needs to be stored in a tank, which can be purchased or rented from suppliers and must be stored in an appropriate location.
The cost of a new central heating boiler is dependent on a variety of different factors, these include the following:
The type of boiler you have installed e.g. combi, regular or system
The boiler model you choose e.g. mid or premium range
If want to relocate your boiler e.g. from the garage to the attic
If you want to convert your boiler e.g. from combi to regular
Any add-ons you purchase e.g. filters, smart controls etc
One of the most common and straightforward type of central heating boiler installations is a straightforward combi swap i.e. replacing your old combi with a new combi. This is much simpler than replacing a combi with a system boiler.
This is due to conversions being more complex to install, taking more time, requiring more labour and more materials. More everything.
The boiler model you choose also has an impact on the cost and at Heatable we offer more value orientated brands such as Alpha, as well as award winning, premium brands such as Worcester Bosch and Viessmann.
Typically, your boiler installer will determine the size you need based on the number of bathrooms and number of radiators you have in your property.
Here are some examples of recommended boiler kW outputs based on your home&#;s estimated demands (Combi boilers only):
What size boiler for&#;
1 Bath/Shower
2 Baths/Showers
2 Bedroom House
26kW
29kW
Get Quotes
3 Bedroom House
29kW
35kW
Get Quotes
4 Bedroom House
29kW
35kW
Get Quotes
5 Bedroom House
35kW
35kW
Get Quotes
Curious to know which boiler brand performed worst? Find out in our report of the worst boilers.
Some people are interested to know the stand-alone central heating boiler costs.
A new combi boiler or system boiler can cost between £600-£900 for a budget model, £900-1,200 for a mid-range model and £1,000 - £2,000 for a premium model.
A regular or heat-only boiler can cost anywhere between £500 - £2,000 depending on size and quality.
Note: you may be eligible to buy a boiler on finance, in which case you could potentially spread the cost over several years.
Without boasting, get your new boiler quote and buy from us.
We're an online, nationwide boiler installation business with 2,000+ 5 star reviews from a shed load of happy customers.
Because we're online, our overheads are low which means we pass those savings on to our customers, ensuring they're always getting the best deal on a new central heating boiler.
You may need a new boiler.
You may need it fast, and with affordable monthly payments.
You may even need it from a company with top end local engineers, with 10,000 Trust Pilot reviews to back them up. Plus a Which? Trusted Trader award for good measure.
You may need a new boiler quote from us, Heatable &#;
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