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Sapphire Boiler Range

Sapphire External Heat Only
Combi Boiler

Sapphire External Combi boilers are designed to deliver high-efficiency heating and hot water for properties where internal space is limited. Encased in a durable, weather-resistant housing, these units provide reliable outdoor performance while incorporating the same advanced modulating technology and ultra-low NOx emissions as the internal range.

Engineered for efficiency and quiet operation, the Sapphire External Combi range includes integrated frost protection as standard. It offers a dependable and space-saving solution for new outdoor installations, as well as an ideal upgrade for older oil-fired systems.

Boilers External Combi

Features and Benefits

  • Fully modulating and OpenTherm certified
  • 25-year heat exchanger warranty and 5-year warranty on all non-serviceable components (T&Cs apply)
  • Output range from 6–32 kW
  • Dual output functionality:
    • Output 1 – Central Heating (CH) kW
    • Output 2 – Domestic Hot Water (DHW) kW
  • Compact, space-saving outdoor design with a robust, weather-resistant casing
  • Multiple flue options available (low level or high level)
  • Three-stage frost protection (no frost, pre-frost, and frost)
  • Direct DHW heating without the need for a thermal store
  • Acoustic dampening for low noise operation—ideal for installations near windows or patios
  • Low NOx emissions
  • Fully compatible with HVO fuel
  • Integrated touchscreen for simple commissioning

Heat only - external

EOGB Sapphire
6-32 kW
Water Content Litre 26.5
Weight (Dry) Heat Exchanger Kg 40
Weight (Dry) Overall Kg 88
Max, Heat output (Kerosene) kW 32
Min, Heat output kW 6
Flow connection mm 22
Return connection mm 22
Condensate connection mm 22
Flue diameter mm 81
Maximum static head m 7.2
Minimum circulating head m 0.5
Boiler thermostat range °C Variable
Primary limit thermostat (safety shut off temp) °C 95 ± 3
Secondary limit thermostat (safety shut off temp) °C 110 ± 3
Maximum hearth temperature °C 100
Electrical supply Volts 1ph-230-50Hz
Total consumption kWh 0.66
Oil connection 2 × 1/4" BSP F
Max operating pressure - sealed sysrems bar 3

Sapphire Pro Rewards

Join our incentive scheme for engineers and earn £500 cashback on every 5th Sapphire boiler installed, or choose an OFTEC Renewal Training & Assessment Course as your reward.

More information
News £500 cashback

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