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Best boilers of 2019

Posted on November 1st 2019

Buying a new boiler can be a stressful exercise. You most likely need one urgently, and with so many options on the market, it can be hard to make a decision. So we’ve bought together some options from our favourite brands here at Diamond Gas & Heating and we think if you choose any of these options, you can’t go wrong…

Worcester Bosch

Diamond Gas & Heating is an accredited Worcester Bosch installer, so of course, we are going to champion this brand. But it isn’t without good reason. The brand has won Which? Best Buy Awards for the past 10 years, and their boilers come with an up to 12 year guarantee, when installed by Diamond Gas & Heating.


In terms of models, the Greenstar range is top notch. There are few different variants within the range which suit different property sizes but the most popular is the award-winning Greenstar i. It is suitable for small to medium properties with one bathroom.

It features simple boiler controls with clear information display, has a condensate discharge resilient to freezing up to -15°C, has a wide choice of controls enables greater comfort and economy, and a low energy pump which reduces electrical usage. Hot water is instantly heated from cold mains, plus it achieves an A+ ErP package efficiency rating for heating when installed with a smart internet connected Bosch EasyControl.

Greenstar Lifestyle

While the Greenstar range is pretty great, the Greenstar Lifestyle range, brand new out this year, is even better. And although this range is pricier if you have the cash then it’s worth paying the extra for the style stakes alone.

The Greenstar Life range builds upon the award winning Greenstar CDi Classic but features a modern new design whilst boasting a range of features that make controlling your heating and hot water easier.

Features include the optional unique Intelligent Filling System, which constantly monitors your boilers pressure and automatically adjusts the pressure as and when it’s needed, an improved display screen with easier to use push control buttons, and wireless connectivity with its smart thermostat, the Bosch EasyControl, meaning you have the power to control your heating and hot water wherever you are.

Greenstar Style

This boiler features all the same high-tech features as Life, but comes in sleek black. With its smart looks as well as its super quiet decibel level, it’s a boiler you probably won’t want to hide in a cupboard.


Founded in 1906, Ideal boasts a rich heritage and it remains at the forefront of the domestic and commercial heating markets, leading the industry in setting new standards and challenging technological boundaries. Like Worcester Bosch it also has some award-winning boilers. Plus, its boilers are all made in the UK.

Logic + Combi

The Logic + Combi is one of the only boilers in the UK to receive Quiet Mark accreditation for its quiet operation. The entire Logic+ range was awarded the Queen’s Award for Enterprise 2013 and Good Housekeeping Reader Recommended Status in 2013 and 2017. The compact boiler comes with a ten year warranty when installed by us, features a fully back-lit LCD display, built-in frost protection and is LPG compatable.


This German brand prides itself on sustainability and efficiency and as well as superior performance and reliability, its Vitodens gas boilers stand out for their user friendly design and ease of use. All of the brand’s boilers have been designed with smart technology in mind, helping you save money and control your comfort from wherever you happen to be.

Vitodens 111-W

There are a few models available from Viessman but its most popular range is the Vitodens, which are all Which? Best Buy recommended. The Vitodens 111-W is a high performance storage combi boiler for the family home. It is rapid, reliable and compact, and its high performance makes it perfect for family homes with a high demand for hot water.


For more than 140 years, Vaillant has been setting the standards in the heating market, creating products that have revolutionised the industry, from water heaters in the early 1900’s, to pioneering the ‘combi’ boiler over 35 years ago, the company says. Today the brand is as proud to be leading the way in renewable technologies, developing systems which utilise sustainable sources of energy. This enables you to enjoy simple, healthy and energy saving solutions for your heating, and hot water needs.

EcoTEC exclusive with Green iQ combi

This Which? Best Buy 2019 award winner promises the very best in boiler performance, control and efficiency. It is fully compatible with Vaillant’s vSMART™ heating control for optimum performance and smartphone app control. It is eco-friendly and 85% recyclable, hand-built at the company’s Derbyshire manufacturing plant, and comes with a five-year guarantee as standard, with seven to 10 years available when you book a Vaillant Advance installer, such as Diamond Gas & Heating.


According to ATAG, what sets it apart from the competition is the fact that it operates in so many countries across the world, with each having their own strict engineering standards. The company has combined all these requirements that today culminates in its ‘i’ range of ATAG boilers. Not only are they the most energy efficient boilers in Europe, ATAG claims, they also have the lowest NOx emissions meaning they’re kinder to the environment.

iC Economiser 35 Plus

Suitable for medium to large homes with more than one bathroom, the iC Economiser Plus combination boiler has hot water flow rates at 16.1 litres per minute and offers instant hot water with pre-heat facility. It features what ATAG describes as an industry leading innovation – its patented Economiser, which recycles the flue gases for optimum energy efficiency. For complete flexibility, ATAG recommends pairing the boiler with its ATAG ONE Zone controller to achieve a maximum A+ Energy rating.