X1 System

The X-ternal sealed system boiler is based on the regular X-ternal model, but with the circulating pump, expansion vessel and safety valve conveniently located within its casing. The X-ternal System is ideal for the smaller property typical of many of today’s new builds where space inside the home is at a premium. It is available in a 12-16kW output. (Also available with a Cream coloured case, see product code X1 System Cream).

The new X1, X1 System is a fully X-Ternal wall hung boiler with a new Low Nox burner to conform to the latest EU Directives regarding low levels of Nitrogen Oxide. These models are based on the Wallstar 1 and share the same water jacket and burner thus ensuring they are a reliable alternative if a Wallstar 1 is not a viable option. The boiler comes with a remote lock out switch that can be sited within the property and the compact dimensions mean it can be fitted conveniently on most external walls.

Product Code X1 System (Brown or Cream)
Number of Bedrooms1, 2
Number of Bathrooms1, 2
Heating SystemSealed
Circulating PumpGrundfos UMP3
Condensate Drain20mm
Condensate TrapIncluded
Drain Socket0.5" BSP
Expansion Vessel7 Litres
Flow and Return1" BSP, 22mm End Feed Return
Frost ThermostatIncluded
FuelClass C2 (28 Second Kerosene)
Fuel Connection10mm
Integrated Balanced FlueIncluded
Manual Reset High Limit ThermostatIncluded
Max Installation Height2.5m From Tank Outlet
Non-Return ValveIncluded
Oil FilterIncluded
Telescopic Flue & Wall Duct Range210-340mm
(+100mm Extension Kit Available)
Tigerloop / DeareatorNot required
Warranty2 years parts & labour,
3 addl. years on Water Jacket
Height Width Depth
Outside Casing 725mm 696mm 395mm
Technical Information 12kW 14kW 16kW
Nozzle 0.45 80O EH 0.5 80O EH 0.5 80O EH
Oil Pressure 100 PSI 100 PSI 120 PSI
CO2 12% +/-1% 12% +/-1% 12% +/-1%
Inner Adjustment Assembly No. 5 No. 5 No. 5