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A system boiler is a unit that heats up water for radiators, taps, showers & anything else linked to your central heating system for you to use. A system boiler has two main parts to it.
The first part is the unit that the mains water enters and heats up the water. The 2nd part is a large storage tank where any hot water that has been heated up is kept until it is needed at any outlets like taps and showers. The radiators are heated up on a separate closed pipeline as and when in the same way.
You need to ensure that you do not mistake a system boiler for a regular boiler which has 2 tanks, one at height usually in a loft space. If you are unsure you can always get a heating engineer to come round and have a look. If you have no tanks at all, you will have a combi (combination) boiler. Combi boilers are the most common boiler in the UK, find out what the best combi boiler is.
So, if you think you have a system boiler and want to know if you should keep it, or change to another boiler e.g a combi boiler, take a look at our guide to system boilers and why you should have shouldn’t get one.
We’ll even give you a guide on some of the best ones to buy along with guide system boiler prices for some of the top manufacturers in the UK right now such as Viessmann boilers, Worcester Bosch boilers, Ideal boilers, Baxi boilers, ATAG & Glow Worm boilers.
Here are some of the main advantages of having a system boiler for your hot water & central heating system:
If you have a larger home with 4 or more occupants then you should really consider a system boiler. The fact your home is larger will also mean that you have space for the hot water tank which is required to store the water. If you think you use ALOT of hot water at peak times such as morning and evenings between you then you should definitely consider a system boiler.
If your hot water tank is insulated properly and you choose the right size boiler for your home, you can have years of low-cost heating.
Nearly all system boilers built in modern times are also condensing system boilers, which means that they re-use some of the wasted energy is re-used within the boiler to continue heating up your hot water. Very clever. They can do this very quickly and an in-built pump ensures that hot water is distributed quickly around the system, saving time and money!
If you already have a system boiler, or want to get rid of that big tank if your loft, then installing a system boiler will be a doddle. You can keep all the excellent hot water attributes flowing through your home and pay less to have one installed in your home as you will just be “swapping” your boiler!
If you want to get rid of every tank in your home, consider a combi boiler, but also consider it may not be the best type for your home.
Because a system boiler uses the mains water supply, you can get a much-improved flow rate at your taps and showers. Who doesn’t love a power shower? If you have a regular boiler you will no longer have to rely on gravity out of your tank. Plus there won’t be one anyway if you change to a system. Happy Days!
How system boilers are set up means that you can also use your solar energy to warm up your water. You need to ensure that your boiler and tank are compatible but if not there are always ways to make sure that they are. This is a great idea towards being self-sufficient in the future and can save you hundreds of £££’s every year.
Some disadvantages of a system boiler installed in your home:
As we have said, system boilers need a hot water tank. These hot water tanks aren’t small. You will need somewhere to house this tank, usually in an airing cupboard or hidden space. But if you don’t have that much room, you may want to look at a combi boiler which is just a single unit that does it all.
If you don’t have a hot water tank big enough or there is an excessive amount of hot water used in your home, you can use up all the hot water. If this happens, you will have to wait till the tank is full again and at the right temperature. Not something you want to be doing when you’re in a rush to work on a morning!
All in all, if you get a tank big enough you shouldn’t really have any issues, but then a large tank requires more space. It really does come down to ensuring you get the right size boiler and tank for your home.
If you are still wanting to swap your system boiler or change to a system boiler then your probably wondering which one you should get?
Well to help we have chosen what we believe some of the best boilers on the market this year. Each boiler is chosen based on not just how good they are, but value for money also.
Viessman is already taking the market by storm because of its economical heating systems that are efficient and offer exceptional value for money.
The Viessmann brand is regarded as one of the best because it offers fantastic performance along with unrivalled reliability in the Viessmann Vitodens range.
The Vitodens combi boiler range has the following features which make it a favourite:
When you get the Vogue Max system boiler, you will enjoy the following features:
These are the top picks for the best combi boilers in 2019 and 2020. The list is also by no means a complete collection of all the boilers you can find in the market but they’re the best in our eyes.
Again, we have judged the above best combi boilers for 2020 by metrics of performance, price, warranty, ease of installation, and maintenance.
You might have seen most brand names in 2018 and 2017 too but that’s because these brands are renowned for consistently crafting amazing boilers and combi boilers.
Buying a new boiler from any of the brands listed above also ensures that even if you don’t pick the models recommended here, you can still walk away with a boiler that will work efficiently and diligently for years to come.
The range of system boilers from Viessmann is not as extensive as other manufacturers however they do have types of boiler for most homes that are suited for a system boiler.
System boilers are usually in homes that are older (found in an airing cupboard usually) or homes that require higher levels of hot water on demand.
These types of boilers have a boiler unit similar to a combi but also have a hot water tank that stores hot water ready for use.
In homes with multiple bathrooms, these boilers are perfect if say there are 3 people using showers at once in the morning getting ready for work.
System boilers are typically higher cost than a combi as you have more components.
A 1-2 bathroom home may have a Viessmann Vitodens 100-W which comes in around £950 (without installation costs).
Then for a mid-sized home with 2-4 bathrooms, you will be best having the same 100-W system but with a higher Kilowatt power rating, and then at the top end is the Vitodens System 200W 35kW.
If you would like to take a look at other system boiler options then the Megaflo unvented system boilers are a great choice.
The above system boiler prices do not include installation by a Gas Safe registered engineer. Viessmann is becoming a very popular name in the UK market which means that many more gas engineers are able to fit these types of boilers to a high quality.
By using a Viessmann accredited installer you can ensure that you keep your long warranty as standard with your boiler. Take a look at to find the perfect boiler for your home and get it fitted by accredited installers.
If you are comparing boiler prices you will find this manufacturer slightly more expensive than others but their reliability and reviews may give you that confidence the extra cost and expenditure is worth it.
Allot of smart appliances work with Viessmann boilers to help you get the most out of your central heating system! Viessmann offers plenty of different control systems that can be used for a huge list of their boilers.
With a wide range that includes:
With these devices, you’re able to control the heating all around the house and set a timer on the thermostat to save money on your energy bills.
By using an app on your smartphone or tablet, you can remotely operate your new boiler anywhere you like. This means you can come home to a warm house after your day at work.
Below are some of the top boiler control systems to help you save money and lower your fuel bills.
If you’re set on buying a boiler from Viessmann then here are a few things that you may need to have prepared.
There are two different scenarios that Viessmann look for when they are offering a quote as standard.
A boiler from Viessmann typically comes 2-7 years warranty but some other companies will offer you 10 years. The new boiler cost can differ slightly dependent on who you purchase your system boiler from.
To maintain your warranty then you will need to service your boiler every 12 months.
When you have chosen the boiler that you want then you will either be offered to pay in full or to finance the boiler.
You will then go through a credit check with Viessmann to make sure you can make payments. All boiler finance options are subject to status.
Your Monthly payments can spread the cost of the boiler over what term would work best for you. Your boiler plan will vary on what boiler you have chosen.
If you do decide to pay monthly for a new boiler then interest rates may apply to the overall price of the boiler will increase ever so slightly compared to a cash price.
All new boilers produced by Viessmann are backed by a parts and labour warranty that can range from 2 to 10 years.
Allowing you to rest easy knowing that if you have a problem with your brand new boiler then you will be provided with free parts and free labour, Subject to warranty conditions.
Depending on the boiler you have chosen you may be offered a free warranty extension or you can also choose to extend it with a payment if this is not offered.
We would recommend that you take a look at Boiler Central where you can get a fixed online price for your new boiler without putting in ANY personal details.
Gone are the days that you need a surveyor to visit your home and try to sell you a new boiler.
Stressed when needed a new boiler but easy process with affordable finance. New boiler installed within a few days with option for next day.
On the day, they came on time. Lovely people, they kept everything clean. Explained everything to me. No mess, kept me informed.
Great experience - quick to arrange, easy to work with the very responsive online team and all installed faster than expected.