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Greenstar Heatslave External 25/32 (discontinued Sept 2013)

Greenstar external oil boiler
Greenstar Heatslave External boiler


The Greenstar Heatslave External condensing oil boilers are designed to be situated outside your property.

The boilers are a great solution when it’s not feasible or desirable to have your boiler inside. They are supplied with an insulated weather-proof cabinet to withstand the elements.

Central heating output: 25-30kW
Hot water flow rate: 22 litres per minute at 35 degree temperature rise.


  • The ErP Directive is a new EU regulation designed to drive improvements in the efficiency of heating and hot water products. Most boilers will fall within the A band, meaning they achieve more than 90% seasonal efficiency, while renewable technologies such as heat pumps will likely be in the A+ or A++ bands.
  • EST registeredThis boiler is registered with the Energy Saving Trust.
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Features and benefits

  • Best official boiler efficiency rating (SEDBUK band A)
  • 5 year guarantee on primary heat exchanger
  • 10 year guarantee on secondary heat exchanger
  • Ideal solution for saving internal property space
  • Can be used with your existing heating controls
  • Pre-heated thermal store – instantly heated hot water
  • High quality insulated weatherproof cabinet – resistant to water, dust and the external elements
  • Built-in frost protection
  • Superior domestic hot water flow rate

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