The Vaillant ecoTEC Pro 24 is a wall-hung, room-sealed condensing combination boiler rated at 24kW, supplied here as a complete bundle with the Vaillant Standard Horizontal Flue Kit (0010039324) and the vSMART Wi-Fi Combi Control Pack (20223154). Built around a patented stainless steel main and secondary heat exchanger, the ecoTEC Pro delivers wide modulation of up to 1:5, Quiet Mark-accredited operation, and a fully front-accessible layout that keeps servicing straightforward. The vSMART control adds internet-connected weather compensation and app-based scheduling, taking the system to ErP Class VI for a 4% efficiency uplift over an on/off room thermostat.
5.9 – 24.8 kW
CH Output Range
A / A
ErP Rating (Htg/HW)
7 yrs
Guarantee (Advance)
Gas Safe Registration Required
Installation, commissioning and servicing of this boiler must be carried out by a Gas Safe registered engineer. The horizontal flue must be positioned in accordance with the clearances set out in the manufacturer's installation instructions, and a Benchmark commissioning checklist must be completed and left with the end user.
Bundle Contents & Compatibility
This listing supplies three separate boxed items designed to be installed together: the ecoTEC Pro 24 boiler (article 0010021836), the 0010039324 Standard Horizontal Flue Kit (990mm, 60/100mm, includes elbow and wall terminal), and the vSMART Combi Control Pack (20223154), which connects via eBUS. The vSMART control communicates over your home Wi-Fi network — a working internet connection is required at the installation address for weather compensation and app control to function.
Why This Bundle
Stainless Steel Heat Exchanger
The patented stainless steel main and secondary heat exchanger resists corrosion from acidic condensate far better than aluminium equivalents, supporting long-term reliability and a straightforward path to the 7-year Advance guarantee.
Wide 1:5 Modulation
The burner modulates down to a low minimum output, so the boiler can idle gently on mild days rather than short-cycling. This keeps the 24kW unit comfortable across up to 10 radiators, 1–2 bathrooms without wasting gas on oversized bursts of heat.
vSMART Weather Compensation
The bundled vSMART thermostat pulls local weather data over Wi-Fi and continuously trims the boiler's flow temperature to match outdoor conditions, cutting energy use versus a standard on/off room thermostat while self-learning the building's heat-up characteristics.
Quiet Mark Accreditation
Independently recognised as one of the quietest boilers on the market, making the ecoTEC Pro well suited to kitchen or hallway cupboard installations close to living spaces.
Push-Fit 60/100 Flue System
The bundled horizontal flue kit uses tool-free push-fit joints and is fully compatible with the wider Vaillant 60/100 extension, elbow and plume management range, simplifying non-standard wall terminations.
Front-Accessible Servicing
All major components can be replaced from the front of the boiler, with removable side panels providing extra access — reducing labour time on future maintenance visits.
Technical Specification
| General |
| Boiler article number |
0010021836 |
| Flue kit article number |
0010039324 (60/100mm, 990mm length) |
| Control pack article number |
20223154 (vSMART Wi-Fi Combi Pack) |
| Boiler type |
Wall-hung, room-sealed, fan-assisted condensing combi |
| Dimensions (H x W x D) |
720 x 440 x 338 mm |
| Guarantee |
2 years standard; 7 years free when registered via Vaillant Advance (10 years for £150+VAT) |
| Heating Performance |
| Nominal heat output range (50/30°C, condensing) |
5.9 – 24.8 kW |
| Nominal heat output range (80/60°C, non-condensing) |
5.2 – 23.0 kW |
| Maximum flow temperature |
85°C |
| Flow temperature range |
30 – 80°C (75°C factory setting) |
| Modulation ratio |
1:5 |
| Domestic Hot Water |
| DHW flow rate (ΔT = 35K) |
9.6 l/min |
| DHW flow rate (ΔT = 42K) |
8.0 l/min |
| Performance & Emissions |
| ErP efficiency (Heating / DHW) |
94% / A rated, A / A+ |
| NOx emissions (EN 15502-2-1) |
27 mg/kWh |
| Sound power (ErP) |
49 dBa |
| Boiler lift weight (dry) |
39.0 kg |
| Flue & Clearances |
| Maximum horizontal flue length (60/100) |
12 m |
| Minimum clearance, sides |
5 mm |
| Minimum clearance, top (60/100 flue) |
165 mm |
| Minimum clearance, below |
180 mm |
| Minimum clearance, front |
500 mm |
| vSMART Control Pack |
| Control class |
ErP Class VI (+4% system efficiency) |
| Connectivity |
Home Wi-Fi, app control for iOS and Android |
| Key functions |
Weather compensation, self-learning, remote scheduling |
| Compatible boilers |
Full Vaillant ecoTEC combi range via eBUS |
Frequently Asked Questions
Does this listing include the boiler, flue, and control, or do I need to buy them separately?
All three items are included in this single listing: the ecoTEC Pro 24 boiler (0010021836), the 0010039324 horizontal flue kit, and the 20223154 vSMART control pack.
Is the horizontal flue kit long enough for my installation, or will I need extensions?
The bundled kit provides a 990mm length, suitable for a standard straight-through wall termination. Longer routes, additional elbows, or vertical termination require separate Vaillant 60/100 extension and elbow accessories, sold separately.
Do I need an internet connection for the vSMART control to work?
Yes. The vSMART control communicates with the boiler via eBUS but requires a home Wi-Fi connection for weather compensation, remote app access, and self-learning functions to operate.
Can I install this boiler myself?
No. UK law requires that all gas boiler installation, commissioning and servicing work is carried out by a Gas Safe registered engineer.
What size property is the ecoTEC Pro 24 suitable for?
With a central heating output range of 5.9 – 24.8 kW, the ecoTEC Pro 24 is best suited to properties with up to 10 radiators, 1–2 bathrooms, subject to a proper heat loss calculation.
How is the guarantee extended from 2 years to 7 years?
The boiler carries a standard 2-year guarantee. Registering the installation through Vaillant Advance extends this to 7 years free of charge, with a further paid upgrade to 10 years available for £150 + VAT.
