System Boilers Guide

System Boilers Guide - The ones with a hot water tank

In this guide for gas system boilers you will find out:

  • What a system boiler is & how they work
  • Should you get a system boiler or not?
  • System boilers prices
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What is a system boiler & how do they work?

A system boiler is 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 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. Combis are the most common boiler in the UK

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 of 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, Worcester Bosch, Ideal, Baxi, ATAG & Glow Worm.


What are the advantages & disadvantages of a system boiler?


Here are some of the main advantages of having a system boiler for your hot water & central heating system:

System boilers are great for homes with high hot water demand.

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.

They can be super economical.

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!

They are easy to install

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.

Better water pressure at your taps & showers

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!

Solar panels can be used to heat the water in your tank too

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:

They have a hot water tank which takes up space

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.

You may have to wait for your hot water!

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. 


Which are the best system boilers to buy?

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.

  1. Viessmann Vitodens 100-W System
  2. Worcester Bosch Greenstar i System
  3. Vaillant ecoTEC Plus System
  4. Vokera Easi-Heat Plus System
  5. Ideal Vogue Max System Boiler

. Viessmann Vitodens – Best Value

System Boilers Guide Compare Boiler Quotes

Viessman is already taking the market by storm because of their economical heating systems that are efficient and offer exceptional value for money.

The Veissmann 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:

System Boilers Guide Compare Boiler Quotes

  • Gas-based combi boiler – comes with a flue kit
  • Has Which? best buy boiler recommendation
  • 10 year product warranty
  • Wireless heating controls
  • Adey Sense filter – completely free
  • System cleanse – completely free.
  • Available in different kW outputs ranging from 50-W to 200-W

3. Vaillant ecoTEC Plus System – 5 star rated

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  • Comes with an app – the vSMART app
  • 5 year warranty – can be upgraded to 7 or 10 years as needed.
  • Available in 4 different kW outputs.
  • Has an ErP rating of A
  • Fast heating of water in storage tank.

4. Vokera Easiheat


5. Ideal Vogue max – Best Small Boilers

System Boilers Guide Compare Boiler Quotes


System Boilers Guide Compare Boiler Quotes

When you get the Vogue Max system boiler, you will enjoy the following features:

  • Compact in size, extremely easy to use
  • Winner of Good House Keeping awards – 2013 and 2017
  • 2 year warranty – can be extended to 5 years

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, easy 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 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.




System Boiler Prices £

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 a 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.

Below Are The Top 10 System Boilers And Their Average Prices ?

(Without Installation costs)

  1. Viessmann Vitodens 100-W System Boiler 19kW – Guide Price £950
  2. Viessmann Vitodens 100-W System Boiler 35kW – Guide Price £1,150System Boilers Guide Compare Boiler Quotes
  3. Viessmann Vitodens 200-W System Boiler 26kW – Guide Price £1,350

The above system boiler prices do not include installation by a Gas Safe registered engineer. Viessmann are 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 Boiler Central 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.

You can opt for pay monthly boiler finance with 0% interest for your new boiler which is great as not many consumers like paying upfront for a new boiler.

Below Are A Full List Of System Boilers And Their Prices



What Technology Works With System Boilers?


Allot of smart appliances work with a Viessmann boiler to help you get the most out of your central heating system! Viessmann offer plenty of different control systems that can be used for a huge list of their boilers.

With a wide range that includes:

  • Wireless room thermostats
  • Wireless remote controls
  • Weather compensation controllers
  • Smart intelligent controls


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 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.



Purchasing A System Boiler

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.

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 finance options are subject to status.

System Boilers On Finance

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 repayments for your new boiler then interest rates may apply meaning the overall price of the boiler will increase ever so slightly compared to a cash price.


System Boiler Warranty With Viessmann System Boilers Guide Compare Boiler Quotes

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 you brand new boiler than 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.


So, what next?

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.

If you still need a little help on what are the best boilers then simply contact us and we will be happy to help.

Click here to get a fixed price now on your new boiler.

System Boilers Guide Compare Boiler Quotes

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