Storage combi boilers are an asset for larger homes that need ample hot water and have more than one bathroom. These boilers don’t feature an external hot water tank and are compact so they are also a great choice for smaller properties with limited space.
Boilerhut is a trusted installer for quality boilers, honest advice, and long-term peace of mind. Our Gas Safe-registered engineers are committed to providing a hassle-free installation process.
A storage combi boiler is a combi boiler with an integrated hot water tank. They work pretty much the same way as combi boilers, but store hot water internally. The lack of a separate cold water storage tank makes them more compact, maximising space and increasing their versatility. Learn more about our range below.
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Energy Efficient Storage Combi Boilers
Combination storage boilers also come with a central heating function, providing both efficient heating and on-demand hot water. Our most recommended and installed storage combi boiler is the Viessmann Vitodens 111-W, which combines the benefits of a system boiler and a combi boiler for versatility and efficiency. They are a reliable choice for UK homeowners, offering a simple home-heating and hot-water solution.
Trusted Installation by Our Certified Heating Engineers
Boilerhut has a team of over 100 Gas Safe-registered heating engineers that provide quality installations across mainland UK. We’re specialists in storage combi boilers, and our team will gladly offer advice on the differences between combi and system boilers and which would be better for your property.
Benefits of a Storage Combi Boiler
While more expensive, storage combi boilers have the benefits of both combi and system boilers. They deliver pressurised hot water like a system boiler and an external hot water cylinder without the external 150-500 litre tank in your home. Learn more about the differences between system and combi boilers in our guide.
On-Demand Instant Hot Water Supply
A standard combi boiler draws cold water directly from the mains supply and heats it on demand. Storage combi boilers also draw cold water from the mains supply, but hot water is fed from the internal tank. The boiler then refills it as it is used. This means hot water can be fed to taps and showers more quickly, instantly meeting your demand for hot water.
Durable in High Usage Homes
These boilers can deliver a flow rate of up to 20 litres a minute, which is enough for up to three showers. Viessmann offers floor-standing and wall-mounted models with different-sized internal hot water tanks, enabling high hot water flow rates for longer periods—no need for separate hot water cylinders in the property.
Enhanced Energy Efficiency
Another great benefit of storage combi boilers, like the Viessmann Vitodens 111-W or 222-F, is their efficiency. Both combi boilers offer efficient central heating, and the hot water storage allows the boiler to reach up to 98% efficiency, helping reduce your energy bills.
This video shows two of our engineers installing the Viessmann Vitodens 111-W storage combi boiler.
Our Storage Combi Boiler Range
Vaillant ecoTEC plus combi store
The Vaillant ecoTEC plus combi store (such as the 40kW ecoTEC plus 940) is a high-performance storage combination gas boiler featuring IoniDETECT gas combustion monitoring.
The Viessmann Vitodens 111-W is a wall-mounted gas condensing storage combi boiler featuring an integrated 46-liter stainless steel hot water tank, a 3.2 to 32 kW heating output range, and built-in Wi-Fi connectivity
The Viessmann Vitodens 222-F storage combi boiler is a premium and highly efficient product from Viessmann boilers. It’s a large boiler that has an integrated 100-litre hot water tank.
We’re proud to be accredited installers for industry-leading brands, ensuring quality and reliability in every installation:
Worcester Bosch
Diamond Level Accredited Installers with 12-year guarantees.
Glow-worm
Affordable, reliable heating solutions.
Vaillant
Innovative boilers designed for durability and performance.
Ideal Heating
Cutting-edge technology for maximum efficiency.
What is the Difference Between Combi Boilers and Storage Combi Boilers?
A combi boiler system provides heat for central heating systems and hot water taps in your home. The difference is how the hot water taps are supplied.
Combi boilers: Heat cold water from the mains supply through a heat exchanger, allowing it to flow through your home to a tap or shower.
Storage combi boilers: Provide hot water from an internal hot water cylinder whilst continually refilling it. This allows a higher hot water flow.
The efficient thermal store is shown in the rear-right of the boiler in this cross-section of the Vitodens 111-W.
Cylinder Loading System Technology
Storage combi boilers use a cylinder loading system (CLS) to keep water hot. It takes cooler water from the bottom of the internal cylinder and pumps it through the plate heat exchanger to keep the water hot. A traditional stand-alone hot water cylinder will use a heating coil to heat the water.
Learn more about the benefits of our heat exchangers in our guide.
Components of a Storage Combi Boiler
Storage combi boiler – Vitodens 111-W breakdown
Using the Viessmann Vitodens 111-W as an example, the diagram shows the components of a storage combi boiler system:
46-litre stainless loading cylinder/storage tank
Stainless steel Inox-Radial heat exchanger
Variable speed combustion fan
Integral expansion vessel
High-efficiency pump
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I couldn't be happier with the service from Boilerhut. From the very beginning, the team was incredibly helpful, knowledgeable, and patient, taking the time to explain the different options and helping me choose the right boiler for my home. Their advice made the whole process straightforward and gave me confidence that I was making the right decision.
I chose the Viessmann Vitodens 050 30kW with the Vitotrol 100-E, and I'm absolutely delighted with it. The quality of the boiler is excellent, it's efficient, quiet, and easy to use, and the Vitotrol 100-E is a fantastic addition that makes controlling the heating simple and convenient.
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This review is about 6 weeks old, I had a new boiler fitted 14 May 26. Didnt do it straight away as needed to let everything settle down as it important to get it right as its a lot of money to spend.
Review has 2 parts both get 5 stars,
1st Boiler Hut, easy to use great range of products sales team Paul was great and helpful, helped me choose right boiler for my needs, Viessman 100 chosen and installed. Great price not as expensive as I was fearing. So far working great, lashings of hot water always available.
2nd part, Installation Team, Cory and Ben turned up approx 0830 and got straight on it, Cory did boiler work (decommision of old boiler and installation of new boiler) whilst Ben attacked my old radiators, taking out 6 old (20 yrs plus) radiators and nasty 10mm microbore piping, replacing with 6 new radiators and new 15mm piping both under floor and surface mounting. All this work completed by 1700hrs same day, guys cleaned up after themselves removed all rubbish and old boiler and rads and pipe work. Can not praise them enough, thanks guys. I would not hesitate to recommend most highly either Boiler Hut or Cory and Ben to anyone who needs a new bolier or fitting, Thanks guys brillant.
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From Placing the order to completion was a seamless process Well done Paul and Rob and Joe were brilliant all set up and ready to use in a day Well done guys thank you
Reasons to Choose A Storage Combi Boiler
A storage combi boiler is ideal if you have a large or growing family. With multiple family members in one household, you will inevitably find that multiple people want hot water simultaneously.
Whether the hot water demand is for the shower, the bath, or the kitchen sink, a storage combi boiler excels. It is equipped to deliver hot water as and when you need it through multiple outlets. Other benefits of these versatile boilers include:
Limited Space Needed: Up to a 150-litre cycle without a water cylinder, allowing you to save space and still get the amount of hot water you need.
No System Boiler: Good alternatives if your house is unsuitable for a system boiler and water cylinder.
Multiple Bathrooms: Can provide a large amount of multi-stream hot water, standing between a combi boiler and a full system.
Large Family: Delivers hot water to multiple outlets without drawbacks, accommodating growing families.
Easy Installation: Easier to set up and install for a heating engineer than a full system.
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Properties Suited Towards Storage Combi Boilers
Depending on how much hot water you need at any one time, a storage combi boiler could be the right choice for you. Storage combi boilers combine heating, hot water and hot water storage. They are excellent for mid-sized homes and large flats or apartments.
If a traditional combi boiler can’t provide the hot water your property needs, a storage combi boiler is a great option if an entire system boiler is overkill. You get to keep your cupboard space, and a model like the Viessmann Vitodens 111-W can be put on the wall like a standard combi boiler.
Storage Combi Boiler Sizes
When choosing a storage combi boiler, it’s essential to consider the size of the property and how much water will need to be heated. Don’t be afraid to take advantage of the space if you have it. When thinking about size, there are two things to consider: how much water you’ll need, and how much room you have.
Viessmann Vitodens 222-F: 32kW is a large, floor-standing storage combi boiler with a 100-litre hot water tank that offers a 300-litre system cylinder.
Viessmann Vitodens 111-W: A wall-mounted boiler that provides water equivalent to a stand-alone 150-litre hot water tank.
The Best Storage Combi Boilers
The most popular storage combi boilers include the folloring three options:
Viessmann boilers are widely regarded as a leading manufacturer of storage combi boilers in the UK, known for high efficiency and reliable performance.
Vaillant boilers also offer strong options, with well-engineered combi boilers designed for energy efficiency and consistent hot water delivery.
Worcester Bosch also provides a trusted range, with combi boiler models available in varying power outputs to suit different home sizes and heating demands.
Viessmann Combi Boilers
Viessmann combi boilers are premium products with superior parts, warranty, and servicing options. Viessmann storage combi boilers offer industry-leading efficiency and can help save you money on your gas bills, paying back their initial installation cost in just a few years.
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1. Viessmann 111-W Storage Combination Boiler
This is a high-performance storage combi boiler, perfect for a larger flat or a family home with high daily hot-water demand. With its CLS technology and 46-litre internal hot water cylinder, this storage combi boiler produces 18 litres of hot water per minute. It can supply multiple hot water outlets simultaneously.
It can also be controlled with a tado° thermostat or the new Viessmann smart thermostat and smartphone app.
Key Features:
Dimensions (H x W x D): 950mm x 600mm x 500mm
User-friendly: Controlled via backlit LCD touchscreen.
Dials: For rapid adjustment of heating and hot water.
Energy Efficiency Class: A-rated for a more sustainable home.
Sustainable Power Sources: Optional solar thermal backup available.
Strong Warranty: Up to a 10-year extended warranty is available with Boilerhut.
The Viessmann Vitodens 222-F is a floor-standing gas storage combi boiler, designed for providing heat and hot water to large homes thanks to its integrated 100-litre hot water tank.
The Vitodens 222-F is designed to easily fit into a kitchen or utility room, allowing for easy installation.
Viessmann Vitodens 222-F Key Features
High Output: Rated heating output: 1.8 to 35 kW.
Integrated: Internal 100-litre hot water cylinder.
This Vaillant combi boiler delivers great performance with lower energy consumption. It produces 20 litres per minute of hot water when needed, and then modulates to use only 16% power, saving you fuel and money.
Vaillant ecoTEC plus Combination Store Key Features
ErP: A-rated for both hot water and heating efficiency.
Dimensions (H x W x D): 720mm x 440mm x 600mm.
Integrated: A hot water storage device at the back of the boiler.
Quick Supply: Hot water within 5 seconds with a fast flow of up to 20 l/min.
Advanced Mechanisms: A wide range of heating control options is available
5-year guarantee: As standard, with 7 to 10 years available when you book a Vaillant Advance installer
The Vaillant isn’t as tall or wide as the Viessmann 111-W, but it is much deeper. It’s essential to take accurate measurements and consult Boilerhut engineers when buying a boiler to ensure it will fit where you want it installed. This boiler may not fit in most cupboards or spaces.
We know storage combi boiler installations can be confusing. Explore our answers to some of the most common questions.
How does a storage combi boiler work?
They work the same way as a ‘normal’ combi boiler, but they include a hot water tank. This allows them to push more water through the home than comes in at the cold-water flow rate for a limited time.
Where should a storage combi boiler be fitted?
Boilerhut also provides expert boiler and heating system installation services, ensuring your boiler is fitted safely and efficiently, in line with manufacturer standards for long-term performance. Storage combi boilers come in different sizes depending on your property’s requirements. They can be, pretty much, the same size as a ‘normal’ combi boiler. They can also be as large as a big single-door fridge – but these come with 170 litre hot water tanks.
How do I maintain my storage combi boiler?
To maintain your storage combi boiler, book an annual service to keep it safe and efficient. Engineers check components, clean the heat exchanger, and test safety systems. This helps protect your system’s capacity and performance. For combination storage boilers, regular care is essential. Boilerhut’s boiler care plans include servicing and support to reduce the risk of breakdowns.
Boilerhut also offers boiler replacement services, helping you upgrade to a more efficient system with safe removal of your old unit and expert installation of the new one.
Do you also install combi and system boilers?
Yes, Boilerhut offers expert installations for both system and combi boilers, recommending the best option based on your home’s needs. System boilers suit higher demand homes, while combi boilers are ideal for smaller spaces.
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We cover many areas throughout Scotland, the main areas including the below. If you dont see your location listed, get in touch to see if we can accomodate your needs:
We install boilers, heat pumps and solar panels for homes in Glasgow, Edinburgh and across Scotland
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