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Combi boilers are a great way to heat your home with high efficiency and on-demand hot water. When it comes to 3-bedroom homes, they can cater to most homes with within-average water consumption, i.e. homes that do not need more than two simultaneous hot water taps running or do not have more than two bathrooms.
We’ve created a selection of the best combi boilers available in the UK and compared them to provide you a list ideal for 3 bedroom houses. Let’s dig deeper into what makes them the best home heating appliances.
While this list is extensive, it may not cover precisely what you need since each home is different. That’s why you should consult a reliable installer. Finding one can be a tough task. There are many options, but you’ll never know if they suit your pricing needs or can provide quality service and the best boiler for your property. Thankfully, we can help with that using our network of qualified engineers.
We’ve personally vetted the best installers in the UK, so you don’t have to. Fill out a 30-second survey, and we’ll provide you with up to 4 free, non-binding quotes. Click the button below to get started.
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We surveyed over 50 prominent boilers to arrive at this final top 5. They are all best suited to 3-bedroom homes and have outstanding specifications.
Model | Output | Efficiency | Price (excl. installation) | Warranty | Fuel type |
---|---|---|---|---|---|
Worcester Bosch Greenstar 4000 | 25kW - 30kW | 94% | £1,100 - £1,400 | 10 years | Gas or LPG |
Ideal Logic2 Max | 24kW - 35kW | 94% | £1,200 - £1,400 | 10 years | Gas or LPG |
Viessmann Vitodens 050-W | 29kW - 35kW | 92% - 97% | £900 - £1,300 | 7 to 10 years | Gas or LPG |
EHC Mercury Electric Combi | 12kW - 26kW | 99% - 100% | £1,300 - £1,700 | 5 years | Electricity |
Alpha E-Tec NX 28kW | 28kW | 93% | £750 - £1,050 | 7 to 10 years | Gas or LPG |
All of these entries have also popped up on numerous best combi boiler lists and have stellar reviews. We cover our selection criteria in depth below the list.
A 24kW to 35kW combi is best for three-bedroom households. The upper range is best for larger 3-bedroom houses with multiple bathrooms, while the lower end of the output spectrum covers smaller homes with lower water consumption. These rates can vary for electric combi boilers, which need between 12kW and 26kW.
Both conventional and system boilers can also be suitable for 3-bedroom houses, but they may have higher running costs. They also take up less space since they do not have any additional components, which can free up room in a storage, loft, or other area.
However, homes that need multiple simultaneous running taps or multiple bathrooms may do better with system and conventional boilers. The best combi boiler for a large house (5+ bedrooms) will have to be above 30kW at minimum.
Worcester Bosch usually tops the bill with their boilers, and this list is no different. The Greenstar 4000 has a lot of variants in terms of outputs and type of boiler, but the best one for a 3 bedroom house is in the 25kW - 30kW combi range.
Worcester Bosch Greenstar 4000 | |
---|---|
Output | 25kW - 30kW |
Efficiency | 94% |
Warranty | 10 years |
Dimensions | 724mm x 400mm x 310mm |
Price | £1,100 - £1,400 |
There are many things that make this one the best mix of all the necessary qualities you would need. The Greenstar 4000 is one of the most efficient boilers on this list, has great heat output, and offers a 10-year warranty. On top of that, it is still reasonably priced, especially for a Worcester Bosch boiler considering the company tends to be on the pricier side.
The Greenstar is the best boiler for a 3 bedroom house due to its mix of performance, efficiency, warranty measures, and value for money.
The Ideal Logic2 Max is a great addition to an already stellar series of boilers, providing improvements in many different areas, such as better troubleshooting and connectivity. Ideal’s boiler range is great for 3 bedroom homes of all sizes, from those with minimal water consumption to those with multiple bathrooms and simultaneous taps.
Ideal Logic2 Max | |
---|---|
Output | 24kW - 35kW |
Efficiency | 94% |
Warranty | 10 years |
Dimensions | 700mm x 395mm x 278mm |
Price | £1,200 - £1,400 |
The Logic Max is also fairly compact, having the lowest dimensions of any gas combi on this list. Despite this, it can be a powerhouse in terms of output, going up to 35kW (which could be good for heating even a 4-bedroom property with one bathroom). To complement its output, it also has great efficiency, matching the Worcester Bosch Greenstar, which ensures that your home will get the most of the fuel you burn.
With the combination of output and efficiency, it can be a great option for homes with higher water consumption while also minimising fuel consumption. It could also potentially be a contender for the best boiler for a 4 bedroom house.
Viessmann’s Vitodens series has various outputs. The 050-W model best suits homes with 3 bedrooms, providing a great output at a very reasonable price. The boiler also has the highest potential efficiency with the right seasonal conditions and proper maintenance.
Viessmann Vitodens 050-W | |
---|---|
Output | 29kW - 35kW |
Efficiency | 92% - 97% |
Warranty | 7- 10 years |
Dimensions | 707mm x 400mm x 350mm |
Price | £900 - £1,300 |
With a stainless steel Inox heat exchanger that has its own individual warranty, Viessmann is offering a long-lasting heating system. Aside from the internal features, it also has a nifty interface with great ease of use features. All of this comes in a fairly compact build that can fit in some smaller spaces.
Viessmann runs a tight ship, and the Vitodens line is one of their finest. That’s why this boiler is best for homes looking for a reliably built boiler with some great features.
The Electric Heating Company has been making some reliable electric boilers for quite a while, garnering quite a lot of positive customer reviews on platforms like Trustpilot (where it has a 4.8 out of 5). The Mercury is one of their most popular models due to its high efficiency and wide heat output range.
EHC Mercury | |
---|---|
Output | 12kW - 26kW |
Efficiency | 99% to 100% |
Warranty | 5 years |
Dimensions | 690mm x 451mm x 258mm |
Price | £1,300 - £1,700 |
Mercury also offers “Weather Compensation & Advanced Service Diagnostics,” which is a fancy way of saying it can adapt the temperature to external conditions. While the low-output versions, like the 12kW edition, can be suitable for homes with a shower, the 26kW version can manage bathrooms with higher water consumption (like those with a large tub).
As the lone electric heating appliance on this list, it can be a great addition to homes off the gas grid or ones with solar panels. The 12kW to 26kW range is ideal for electric boilers that need to provide hot water for 3-bedroom homes.
Alpha’s E-Tec line has a number of great entries, and the NX is no different. With a 28kW output, it can comfortably supply water to the average UK home. It has a decent flow rate while having fairly compact dimensions and some novel design choices in the heat exchanger. The efficiency is also on the higher side (93%), especially considering the price.
Alpha E-Tec NX | |
---|---|
Output | 28kW |
Efficiency | 93% |
Warranty | 7 - 10 years |
Dimensions | 712mm x 440mm x 269mm |
Price | £750 - £1,050 |
The boiler maintains a high efficiency by adjusting heat flows in real time and is compatible with external sensors that can improve weather detection. Open Therm and Alpha BUS controls allow for better connectivity as well. While the boiler comes in a variety of sizes, the 28kW system is the best bang for your buck.
Alpha is a great company with a solid reputation which is why this boiler is best for homeowners looking for a reliable boiler at a generous price.
If you’re still asking yourself, “What size boiler do I need for a 3-bed house?” or “Which of these will suit my home?”, then it might be best to call an installer. A reliable one can be a great resource for in-person knowledge as they assess your property and give you the best advice.
Finding a reliable installer on your own can take hours of research, and you may still not find the best offers. That’s why our service is a far better alternative. All you need to do is fill out a 30-second form, and we’ll handle the rest as you get the best prices in your area from installers we’ve personally vetted.
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A combi boiler requires over 24kW of capacity. This ensures that your home will have adequate heating and hot water.
The Worcester Bosch Greenstar and the Viessmann Vitodens are the most reliable boiler series, with great warranty options and well-constructed heating systems.
A new combi boiler can £1,200 to £1,500 on average, with some options being as low as £750 (excluding installation costs).
A 24kW boiler can be ideal for smaller 3 bedroom houses, however they are not suitable for every home.
Rawal Ahmed is a writer at GreenMatch with an interest in sustainability and a background in tech journalism and digital marketing.
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