NCB-CE Gas Condensing System Boiler

Comprising four system boiler models, with outputs from 20 to 33kW, the NCB-CE A-rated gas condensing boilers deliver outstanding ErP efficiencies from a standalone unit. In addition to low NOx emissions (class 6), all NCB gas Combi boilers are water resistant to an IPX5 rating offering peace of mind, while each unit is easy to handle for simple, fast and cost-effective installation.

  • ErP A+ energy efficiency rating for ultra-low running costs*
  • Extended venting up to 20m allowing flexible installation
  • IPX5 rating provides protection from any water leaks
  • Smartphone compatible offering remote adjustments of heating and hot water systems
  • Smart weather forecasting and Geofencing maximise efficiencies and convenience
  • 7-year parts and labour warranty for complete peace of mind
  • Stainless steel heat exchangers for optimum durability and long term efficiencies
  • 3-zone ready with Smart Plus control pack

* An A+ energy rating is achieved when installed with 3 Smart Plus room thermostats.

Technical Data

Heat Output Heat input range 20.0/4.2kW 24.0/4.2kW 29.0/5.1kW 34.0/4.0kW
Modulation (max/min) 1:10 1:10 1:10 1:10
Heat output range @ 80/60°C 19.5/3.9kW 23.4/3.9kW 28.3/4.9kW 33.2/3.8kW
Condensing heat output range @ 50/30°C 21.4/4.5kW 25.6/4.5kW 31.1/5.4kW 36.3/4.3kW
Full load efficiency at Max./Min. output @ 50/30°C (Condensing) 106.9/107.8kW 106.6/107.8kW 107.3/106.9kW 106.9/106.9kW
Max. heating operation pressure 2.5 bar
Max. heating temperature
Adjustable heating temperature range
Flue Flue exhaust/Air intake system diameters Coaxial Ø60/100 and Ø80/125–Dual duct Ø80/80
Max. horizontal coaxial length ø60/100 20m
Max. horizontal coaxial length ø80/125 68m
Weight 38 42
Dimensions 440 x 358 x 695mm 440 x 408 x 695mm
ErP Efficiency ErP A (94%)
ErP Efficiency with Smart Plus (x3) ErP A+ (98%)
NOx Classification Class 6

NCB-CE Gas Condensing Boiler FAQs

What does the fault code E302 mean for NCB-CE boiler?

The E302 fault code means that the system pressure is too low and you may see that the system pressure gauge indicates that the pressure in the system is below the 1 bar pressure.

To re-pressurise the system you will find a filling loop (copper ‘U’ shaped tube with two nuts at each end) on the underside of the boiler or a metal braded flexible hose external of the boiler on the pipework with one or two tap connections at the either end of the filling loop. The tap or taps should be opened a quarter of a turn and the water will start to refill the system (water should be heard filling the system). You should see the pressure gauge rise back up between 1 bar and 1.7 bar pressure and then stop filling.

Boiler information on water pressure can also be seen on the digital display by pressing the Eco button for 6 seconds and then scroll through to ‘A6’ which will display the water pressure. Once the pressure gauge between 1 bar and 1.7 bar turn the taps back to the off position and the water will stop filling the system. The error code 118 will stop and the boiler will now operate. If the error code 118 is still active, fill up the system a little more but not over 2.0 bar.

(If you do fill the system too much and the pressure gauge is too high, just bleed water from a radiator until the pressure on the gauge goes down to below 1.7 bar).

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