Vaillant Boiler Prices and Reviews Written by Jonathan Whiting Updated on 2 August 2023 ✔ Vaillant is one of the UK’s leading boiler manufacturers✔ Vaillant makes gas boilers that cost between £850 and £2,500✔ You can choose between more than 30 Vaillant boiler modelsResearching new boiler costs? Consider looking at Valliant boilers, one the best-known manufacturers.Read on to find out about the different boiler options that Vaillant provides.Alternatively, you can skip the reading and pop your details in this short form — once you've provided your details, our expert installers will be in touch to give free boiler quotes.What's in this guide to Vaillant boilers?01 | Vaillant boiler prices02 | Vaillant combi boiler prices03 | Vaillant conventional boiler prices04 | Vaillant system boiler prices05 | Vaillant boiler reviews06 | Vaillant vs. competitors07 | How do you buy a Vaillant boiler?08 | Next steps Vaillant boiler pricesVaillant manufactures upwards of 30 models in combi, conventional and system designs. Its boilers come in a range of sizes, from 12kW up to a huge 65kW, designed to meet the heating and hot water demands of differently sized homes.The price of Vaillant boilers typically ranges from £800 to £1,500, but can cost up to £3,000 for large models. As a rule of thumb, the bigger the Vaillant machine you need, the more it will cost.The table below shows you the size and price range of Vaillant combi, conventional and system boilers currently available:Boiler TypeSize (kW)Price RangeCombi25 to 48£900 to £2,100Conventional12 to 35£870 to £1,650System12 to 37£860 to £1,550These prices are for the boiler only; they exclude installation costs. Installation typically costs between £500 and £1,500, depending on the complexity of the job.For example, changing from one type of boiler to another, changing the location of your boiler, or moving and adding pipes will all drive up the cost.To get more information about the cost of boiler installation, visit our page on how much a new boiler might cost.Read on to get more information about how much combi, conventional and system boilers cost from Vaillant. What Size Vaillant Boiler Do You Need?You should choose which boiler size is right for your home based on a number of factors, including how many bathrooms, taps, and radiators your property has.As a rough guide, here's the power output you'll need from your boiler:For a home with 1 bathroom and up to 10 radiators: 24kW to 27kWFor a home with 1 or 2 bathrooms and up to 15 radiators: 28kW to 34kWFor a home with 2 or more bathrooms and up to 20 radiators: 35kW to 42kW Vaillant combi boiler pricesA combination or ‘combi’ boiler heats water directly from the mains when you turn on a tap or switch on your central heating. This means that unlike a conventional or system boiler, you won’t need a separate hot water cylinder or a cold water tank stored in your loft.Vaillant makes a wide range of combi boilers that cost anywhere from £850 to £2,200, excluding installation. The company's combi boilers come in ecoFIT pure, ecoTEC plus, ecoTEC pro and ecoTEC exclusive Green iQ models.The table below shows you the price of Vaillant’s most popular combi boilers, as well as their size, energy efficiency and warranty period:ModelSize (kW)EfficiencyStandard WarrantyPriceecoFIT pure 4121294%2 years£850ecoFIT pure 8303094%2 years£1,000ecoTEC exclusive 8353594%5 years£1,400ecoTEC plus 8323289.3%2 years£1,500ecoTEC plus 4353594%5 years£1,800ecoTEC pro 24kW2494%2 years£2,000ecoTEC pro 30kW3093%2 years£2,200 Vaillant conventional boiler pricesA conventional boiler, also known as a heat-only or regular boiler, needs both a hot water cylinder and a cold water tank to feed hot water to your radiators and taps/shower. These will both usually need to be stored in your loft.Vaillant make conventional boilers in the ecoFIT pure and ecoTEC plus models that range in output from 12kW to 35kW. The price of Vaillant conventional boilers starts at £670 and goes up to £1,400.The table below shows you the cost of popular Vaillant conventional boilers, and includes their size, efficiency and warranty period.ModelkW outputEfficiencyStandard WarrantyPriceecoFIT pure 4181894%2 years£841ecoFIT pure 4252594%2 years£906ecoFIT pure 4353594%2 years£1,457ecoTEC plus 4151594%5 years£861ecoTEC plus 4242494%5 years£1,031ecoTEC plus 4303094%5 years£1,090ecoTEC plus 4353593%5 years£1,539 Vaillant system boiler pricesVaillant manufacture system boilers in the ecoFIT pure, ecoTEC plus, and ecoTEC exclusive Green iQ models. Prices start at £800 and go up to £3,000.A system boiler heats water directly from the mains when you turn on your central heating, warming your radiators.However, when you turn on your tap or shower, the hot water from your boiler is first pumped through a cylinder stored in the upper levels of your home.The table below shows you the price of some of Vaillant’s most popular system boilers, including their size, efficiency and warranty period.ModelSize (kW)EfficiencyStandard WarrantyPriceecoFIT pure 6181894%2 years£950ecoFIT pure 6252594%2 years£1,000ecoFIT pure 6303094%2 years£1,200ecoTEC exclusive Green iQ 6272794%5 years£1,345ecoTEC plus 6181894%5 years£1,120ecoTEC plus 6242494%5 years£1,221ecoTEC plus 6303094%5 years£1,347 Vaillant boiler reviewsVaillant boilers have an excellent reputation among their customers and boiler engineers. The company has a 4.6/5 rating on Trustpilot, based on around 9,000 reviews.Out of the thousands of customers who left feedback, 88% have rated the company as ‘excellent’ or ‘great'. Many customers have praised the quality of Vaillant’s boilers and their helpful engineers and support team. Did You Know? Only of 7% of customers say they've had a ‘poor’ to ‘bad’ experience with Vaillant Vaillant vs. competitorsWhile Vaillant is one of the best boiler manufacturers in the UK, there are a number of other brands that are worth considering.Worcester Bosch, Viessmann, Grant and Ideal also feature alongside Vaillant in our list of the top five boiler manufacturers. Below is a quick rundown of the scores these companies have received from us and Trustpilot.BrandTrustpilot ScoreThe Eco Experts ScoreGrant9.5/10 ★ ★ ★ ★ ★Ideal5.6/10 ★ ★ ★ ★ ★Viessmann8.3/10 ★ ★ ★ ★ ★Worcester Bosch9.1/10 ★ ★ ★ ★ ★As you can see, these boiler brands have scored similarly to Vaillant across the board (apart from Ideal), with Worcester Bosch and Grant receiving slightly higher scores than Vaillant from Trustpilot.Ultimately the brand you choose – whether it’s Vaillant or one of its competitors – will come down to who offers the best boiler for your home and budget.To get a quote for a new boiler from trusted boiler installers in your area, just fill in this short form to arrange a free home assessment. How do you buy a Vaillant boiler?Selecting the right boiler is an individual scenario and best assessed by a heating engineer to ensure you purchase the right type.Vaillant encourages potential customers to join its installer loyalty scheme, Advance.This way you are given access to their network of fully trained, independent installers who can offer you exclusive extended guarantees, as well as a free no obligation quote to assess which Vaillant boiler you need. Next stepsFeel confident about that you know enough about Vaillant boilers? Hopefully now you'll be sure whether this manufacturer is the right one for you.Once you've made this decision, enter your details on our short form, and a local installer will be in contact with you shortly.Happy heating! Written by: Jonathan Whiting An eco hero with a head for numbers, Jon's data visualisation skills are legendary. Whether it's determining what countries will survive climate change or the animals most at risk from it, he has the planet's best interests at heart.