Toggle Nav
fast delivery
Fast Delivery
With our own fleet.
fast delivery
Trusted Service Award
fast delivery
Free Click and Collect
Click and collect from any of our stores.

Vaillant EcoTEC Exclusive Green iQ 843 (ErP) Combi Boiler, Quick-List

Current Quick List Price

Add products

The new Vaillant EcoTEC Exclusive Green iQ is Vaillant's first ever boiler product with the power of Green iQ technology. 

Combining our complete range of smart technologies and features, you can be sure you’re fitting the very best when you fit new ecoTEC exclusive. As well as providing great performance, the new ecoTEC exclusive intelligently manages consumption and output to keep all its components running at peak performance, for longer, providing a low-maintenance solution that you can rely on.

  • Wide modulation range of up to 1:10 - adapts perfectly to all systems in every situation, ensuring lowest fuel bills for your customers
  • All-gas system - always reaches optimal combustion with lowest emissions. As a self-adaptive system, it automatically adjusts to all types of gas
  • Extra-Condense heat exchanger - taking overall combi boiler efficiency to the next level, and almost eliminating plume in DHW mode
  • Green iQ Mode - outstanding eco-credentials from Vaillant’s latest boiler range, which optimises running cycles, results in even lower gas consumption and the boiler is highly recyclable (85%) at the end of its life
  • Compatible with Vaillant’s vSMART™ heating control
  • Standard 5 year warranty. 7 year warranty when registered by an Advance installer
Manufacturer Product Number
Manufacturers Warranty
7 Years (Subject to Manufacturers T&C's)
Mr CH's Warranty advice
Warranty Terms and Conditions
Boiler Model
ecoTEC Exclusive Green iQ
Boiler Type
Combination Boiler
Fuel Used
Natural Gas
Boiler Height
Boiler Width
Boiler Depth
Boiler CH Output (Kw)
Max DHW Output (Kw)
Boiler CH Output (BTU)
Domestic hot water flow rate
14.5L @ 35°C Rise
Energy Efficiency
ErP Hot Water Rating
A Rated for Hot Water
ErP Heating Rating
A Rated for Heating
Customer Questions
What are the internal and external sizes of the BoilerBox

Inner - 76.8cm L x 57cm W x 41.5cm H - Outer - 80cm L x 60cm W x 44.5cm H

Please mind that only logged in users can submit questions.
No reviews have been left for this product yet. Please be the first to leave a review if you purchase.

Enter product quantities below, then add Quick List to Basket

Grouped product items
Vaillant ecoTEC Exclusive Green iQ 843 (ErP) Combi Boiler Only
£1,756.86 £1,464.05
+ -
Vaillant Standard Horizontal Flue c/w Elbow and Terminal
£90.97 £75.81
+ -
Vaillant White Variable Termination Kit
£64.30 £53.58
+ -
Vaillant Black Variable Termination Kit
£64.30 £53.58
+ -
Vaillant Vertical Flue Terminal
£119.02 £99.18
+ -
Vaillant Adjustable Pitched Roof Tile
£24.29 £20.24
+ -
Vaillant Flat Roof Penetration Collar
£24.29 £20.24
+ -
Vaillant 45 Degree Flue Bends (Pack Of 2)
£68.06 £56.72
+ -
Vaillant 87 Degree Flue Bend
£38.30 £31.92
+ -
Vaillant 470 mm Flue Extension
£31.81 £26.51
+ -
Vaillant 970 mm Flue Extension
£45.83 £38.19
+ -
Vaillant 1970 mm Flue Extension
£82.76 £68.97
+ -
Vaillant 1 Metre Black Variable Termination Extension
£15.73 £13.11
+ -
Vaillant 87 Degree Black Variable Termination Bend
£16.08 £13.40
+ -
Vaillant 45 Degree Black Variable Termination Bends (Pack Of 2)
£24.29 £20.24
+ -
Vaillant Black Plume Deflector
£43.09 £35.91
+ -
Vaillant 1 Metre White Variable Termination Extension
£15.61 £13.01
+ -
Vaillant 87 Degree White Variable Termination Bend
£16.08 £13.40
+ -
Vaillant White Plume Deflector
£43.09 £35.91
+ -
Vaillant 45 Degree White Variable Termination Bends (Pack Of 2)
£24.29 £20.24
+ -
Go to top

Current Quick List Price

age verification

Age Verification

This product can only be sold to customers over 18 years of age and we will require your date of birth on your account at checkout.

What’s BoilerBox?

Get the cost of BoilerBox refunded once BoilerBox is returned!*

Helpful tools
MRCH BTU calculator BTU Calculator
MRCH find an installer Find an Installer