Viessmann Vitodens 050-W System Boiler Cost with Installation

If you already know the Viessmann Vitodens 050-W from the combi range, the system version brings the same German engineering – the Inox-Radial stainless steel heat exchanger, built-in WiFi, and compact 700mm footprint – to homes that need something a combi can’t deliver. 

The 050-W system is available in 19kW and 25kW, both ErP A-rated at 92% efficiency, and both LPG compatible without a conversion kit.

See more of the Viessmann Vitodens 050-W System specifications below:

Viessmann Vitodens 050-W System Product Table
	Available outputs	19kW	25kW
	Type	System	System
	Fuel	Gas / LPG	Gas / LPG
	Condensing	Yes	Yes
	Efficiency rating (%)	92	92
	ErP	A	A
	LPG compatible	Yes (no kit required)	Yes (no kit required)
	Standard guarantee	3 years (7 with Academy Trained Installer) *
	Max output (kW)	19	25
	Flow rate (l/min)	Determined by cylinder size
	Mounting	Wall-mounted
	Dimensions (mm)	700 x 400 x 300
	Typical price (incl. VAT)	£1,050	£1,150
	Typical installation cost (incl. VAT)	£1,500
	Total cost	£2,550	£2,650

*Terms and conditions apply.

Viessmann Vitodens 050-W System overview

The Vitodens 050-W system boiler is Viessmann’s entry point into the system boiler category – and it’s a strong one. Rather than designing a budget product to sit at the bottom of the range, Viessmann has kept the core components of the wider Vitodens 050-W range intact: the stainless steel Inox-Radial heat exchanger, the MatriX-Plus burner, and the built-in ViCare WiFi connection. 

What changes is the configuration. Where the combi heats hot water on demand from the mains, the system boiler charges a separate hot water cylinder, giving you large volumes of stored hot water that multiple outlets can draw on at the same time.

The practical case for choosing the system version over the combi is straightforward: two bathrooms used regularly, a household that runs out of hot water with a combi, or a property already set up with a cylinder that makes a like-for-like system replacement the sensible choice. 

The 19kW suits smaller homes and flats with a cylinder; the 25kW covers the typical three to four bedroom family home. If you are switching from a combi and have no existing cylinder, budget an additional £500-£1,000 for a new unvented cylinder and fitting.

Viessmann Vitodens 050-W System Range
Model output size	Suitable for	Radiators	Notes
19kW	Flats, small homes, 1-2 bedrooms	Up to 10	Pairs well with a 150-litre cylinder
25kW	Medium homes, 3-4 bedrooms	Up to 15	Most common choice for family homes

Output selection for a system boiler is based on the property’s heat loss rather than the number of bathrooms – the cylinder handles hot water capacity separately. A Gas Safe engineer will calculate the correct output from a property survey. For most three-bedroom homes, the 25kW is the right starting point, but insulation quality, ceiling height, and property type all affect the calculation.

Key benefits at a glance

• ErP A-rated efficiency (92% efficient)
• Inox-Radial stainless steel heat exchanger – 10-year component guarantee
• Built-in WiFi with ViCare app control as standard
• Compact cupboard-fit design – just 700mm tall, 300mm deep
• LPG compatible – software conversion, no physical kit required
• MatriX-Plus burner for quiet, efficient operation
• 1:6 modulation range for efficient low-demand operation
• Compatible with smart controls via OpenTherm
• Frost protection built in
• 3-year standard warranty, up to 10 years with Viessmann Academy Trained Installer*
• Hydrogen blend ready (up to 20%)

Viessmann Vitodens 050-W System technical specifications

This is where the 050-W justifies its reputation as a premium-lite product. At this price point, most system boilers use aluminium heat exchangers and offer limited modulation. 

The Vitodens 050-W brings a stainless steel Inox-Radial exchanger and a 1:6 modulation range – components more commonly found in boilers costing £300-£400 more.

Output and efficiency ratings

Both models carry 92% ErP A-rated efficiency. As condensing boilers, they recover heat from exhaust gases that older non-condensing boilers expelled – the same condensing mechanism as a combi, with the difference that the heat charges a stored hot water cylinder rather than delivering hot water directly to the tap.

The 1:6 modulation range means the 25kW model can operate as low as approximately 4kW under light demand. This is meaningfully wider than many rival system boilers in this class, which results in less on-off cycling during mild weather and more stable heating distribution – something you’ll notice in the evenings when the house has reached temperature and only needs a light top-up rather than a full firing cycle.

Dimensions 

Both outputs share identical dimensions: 700mm tall, 400mm wide, and 300mm deep. At 700mm, the 050-W system boiler is among the most compact system boilers available – particularly relevant for retrofit installations in older properties where the boiler position is constrained.

 It fits neatly into a standard kitchen cupboard, and at a weight of around 30kg it is manageable for two engineers to position without difficulty.

Components included

The Inox-Radial stainless steel heat exchanger is the standout component. Viessmann uses stainless steel where most manufacturers at this price point use aluminium, and the difference matters over a 10-15 year ownership period. Stainless steel is more resistant to corrosion and limescale build-up – particularly relevant in hard water areas – and carries a separate 10-year component guarantee regardless of the overall boiler warranty tier.

The MatriX-Plus burner sits at the heart of the heat exchanger and is designed for low noise and low emissions. It contributes to the boiler’s quiet operation and is one of the reasons the 050-W range is suitable for installation in living spaces as well as utility cupboards.

Built-in WiFi connects directly to the ViCare app, which gives you remote control of heating schedules, temperature, and system status from your phone without needing to buy a separate smart hub. For homeowners who want a physical thermostat, the boiler is fully OpenTherm compatible and works with Nest and Tado controls for advanced modulation. Standard on/off thermostats like Hive are also compatible, though they don’t unlock the full modulation benefits.

Prices and installation costs

The Viessmann Vitodens 050-W system boiler costs approximately £1,050 for the 19kW and £1,150 for the 25kW, including a standard horizontal side-wall flue. These prices cover the boiler unit only – the hot water cylinder is a separate purchase. Where a vertical roof flue is required rather than a side-wall exit, budget an additional £300-£500 for the more complex installation.

For LPG properties, the software conversion is handled by the engineer on installation day with no additional parts required – saving £40-£60 compared to boilers that need a physical conversion kit. This is one of the more practical cost advantages of the 050-W for off-grid properties.

Using a mid-range installation figure of £1,500:

Viessmann Vitodens 050-W System Costs
Output size	Unit cost (incl. flue)	Total (incl. installation)
19kW	£1,050	£2,550
25kW	£1,150	£2,650

These prices are indicative only, based on our research and actual boiler prices submitted to WhatPrice by homeowners. For a broader overview of system boiler costs, see our system boiler cost guide.

Warranty and support

The warranty structure on the Vitodens 050-W system boiler rewards homeowners who use a Viessmann Academy Trained Installer. The standard cover with any Gas Safe registered engineer is 3 years – shorter than most rivals at this price point. Using a Viessmann Academy Trained Installer extends this to 7 years, and the 10-year tier is available under specific conditions.

The Inox-Radial stainless steel heat exchanger carries a separate 10-year component guarantee regardless of the overall warranty tier, which provides protection on the most expensive component in the system.

Installation information

A like-for-like system boiler replacement on existing pipework typically completes in a day. The 050-W’s compact dimensions and straightforward design make it a clean installation for experienced engineers.
If a new unvented cylinder is being fitted alongside the boiler, expect the job to take one to two days and confirm that your installer holds a G3 unvented hot water qualification in addition to Gas Safe registration.

What to expect on installation day

Do you need a system flush or filter?

UK Building Regulations require a magnetic filter on any new boiler installation. For the Vitodens 050-W, Viessmann recommends a compatible filter such as the Viessmann Vitoset or Adey MagnaClean Pro2 – fitting one also satisfies the regulatory requirement and is often a condition of the extended warranty. Budget £80-£150 for a quality filter.

A powerflush of existing pipework is not legally required but is strongly recommended on systems over ten years old. Connecting a new boiler to dirty pipework reduces efficiency and increases the risk of early component failure. Budget £350-£800 depending on the number of radiators.

Finding a Gas Safe registered engineer

All gas boiler installations must be carried out by a Gas Safe registered engineer. For the 7-year warranty, the installer must hold Viessmann Academy Trained status – this is worth confirming before booking rather than after installation. For new unvented cylinders, a G3 qualification is additionally required. 

Use the WhatPrice quote service to be matched with vetted, Gas Safe registered installers in your area.

Reviews and ratings

Viessmann holds a 4.6 out of 5 rating on Trustpilot UK, based on thousands of reviews. The 050-W generates strong model-specific feedback:

Positive reviews

Quiet operation, precise temperature control, and build quality are the themes that come up again and again. Owners regularly describe the boiler as more impressive than expected – particularly those switching from older UK brands who notice the improvement in heat-up times and temperature stability immediately. 

The 10-year warranty is frequently cited as the deciding factor at purchase, and the ViCare app draws specific praise for offering considerably more data and functionality than third-party controls like Hive. 

One owner puts it simply: for the first time in their experience, the boiler holds the set temperature without overshooting or dropping. That’s the modulation doing its job.

Negative reviews

Noise is the most significant concern in the pool, and it goes against Viessmann’s Quiet Mark claim. One owner describes the burner firing as sounding like a “bomb going off” in the kitchen, with an engineer who attended finding nothing unusual. The owner noted the efficiency is significant (bills down by roughly a third) but says the noise makes it a purchase they regret. Given Viessmann’s marketing around quiet operation, it’s worth flagging – particularly for open-plan kitchens or boiler positions close to living spaces.

On long-term reliability, one ten-year owner reports three heat exchanger replacements over the decade despite annual servicing and two full system flushes. Viessmann attributed this to water quality. A separate reviewer flags that this was a known issue with older Viessmann models and notes they were told the 050 series has resolved it.

How the Viessmann Vitodens 050-W System compares

Viessmann Vitodens 050-W System Comparison Table
Model	Viessmann Vitodens 050-W System	Worcester Bosch Greenstar 4000 System	Vaillant ecoTEC plus System
Typical unit price (25kW)	£1,150	£1,200	£1,150
Heat exchanger	Stainless steel (Inox-Radial)	Aluminium	Stainless steel
Standard warranty	3 years	5 years	2 years
Max warranty	10 years	10 years	10 years
Built-in WiFi	Yes	Yes	No
App control	ViCare (built-in)	EasyControl (built-in)	vSMART (optional)
Cupboard fit	Yes (300mm deep)	Yes (310mm deep)	Yes
LPG compatible	Yes (no kit)	Yes	Yes
Max output	25kW	24kW	35kW

For personalised guidance on choosing the right boiler, we recommend speaking with a Gas Safe registered engineer.

Final thoughts – is the Viessmann Vitodens 050-W System right for you?

The Vitodens 050-W system boiler makes the most sense for two groups of homeowners. The first is anyone already running a system boiler who wants a like-for-like replacement with better technology – the stainless steel heat exchanger and built-in WiFi are genuine upgrades over most rivals at this price. The second is any household that has outgrown a combi and needs the stored hot water capacity that a cylinder provides, but wants to keep the compact, cupboard-fit profile of a smaller unit.

The warranty structure is the main practical consideration. At 3 years standard, the 050-W system boiler falls short of the Worcester Bosch Greenstar 4000 System’s 5-year baseline – a meaningful gap on a component you expect to run for a decade. The route to 7 years runs through a Viessmann Academy Trained Installer, which is worth confirming before you book rather than discovering afterwards. Once you have Academy installation and the heat exchanger’s separate 10-year guarantee in place, the long-term cover is competitive with anything in the class.

Against the Worcester Bosch Greenstar 4000 System, the 050-W is marginally cheaper at 25kW and brings a stainless steel heat exchanger where Worcester uses aluminium – a genuine specification advantage, particularly in hard water areas. Worcester’s 5-year standard warranty and more extensive Accredited installer network are the counterarguments. Against the Vaillant ecoTEC plus, the 050-W matches on price and heat exchanger material, adds built-in WiFi, but gives up the ecoTEC plus’s wider output range (up to 35kW) for larger properties.

FAQ