Greenstar 100



Space heating boiler for connection to a hot water tank with unsurpassed performance and control. With special insulation to ensure ultra quiet operation and the exclusive keypad safety lock feature to prevent unwanted tampering with heating controls, this unit is the ideal "green" upgrade for detached & terraced houses and is also suitable for apartments.




Energy-saving & environmental features


  • Aluminum-Silicon heat exchanger delivers high efficiency - 98.5% with low temperature applications (96.0% AFUE)
  • Low NOx emissions ahead of 2012 SCAQMD regulations
  • Simple, intelligent control options optimize efficiency and fuel consumption
  • Low electrical consumption when the boiler is in standby mode
  • Electronic ignition
  • Anti-cycle and modulation control

End user comfort & convenience features


  • Limited lifetime heat exchanger and 5-year parts & labor warranty
  • All models available as NG or LP
  • Special insulation ensures ultra-quiet operation
  • Compact dimensions and built-in frost protection offer flexibility for location of installation
  • ECO mode for energy saving fuel consumption
  • Exclusive safety feature - keypad safety lock prevents unwanted tampering with the heating controls
  • Eligible for 2011 Federal Tax Credit




 Al-Si heat exchanger 

Each unit features an ASME approved Al-Si heat exchanger constructed of advanced Magnesium-Aluminum-Silicon alloy - offering increased flexibility versus traditional stainless steel. They are equipped with highly durable heating blocks that are corrosion resistant and designed to optimize clean burning combustion over an extra large surface area, which requires minimal servicing and reliance on spare parts during the boiler’s lifetime.


Full modulating fan assembly 

A full modulating fan automatically increases or decreases its speed according to the amount of gas coming into the boiler depending on the heat demand. This process, called modulation, prevents the boiler from either having too little or too much air in the unit for optimal combustion - ensuring high efficiency.






Greenstar 100Performance Specifications
Fuel NG/LP
Input Maximum (MBH) 100.8
Input Minimum (MBH) 24.6
DOE Heating Capacity (MBH) 89.4
Net I=B=R (MBH) 79
AFUE 96.0%
Low Temp Application Efficiencies 98.5%
DHW Flow Max (ΔT at 72°F) -
Water Volume 0.952 Gal. (3.5 L)
Technical Data Technical Data
Weight (without packaging) 103.6 Lbs. (47 kg)
Dimensions (w x h x d) 17.4" x 33.5" x 13.9"
Minimum Recommeded Pipe Size 1"
Supply Tappings 1"
Return Tappings 1"
Domestic Hot Water Supply -
Domestic Cold Water Supply -
Gas Connection Size ¾"
Vent Size 2"-3"
Vent Material PVC/CPVC
Combustion Air Size 2" - 3"
High Altitude Capability No De-Rating up to 7,000'
Gas Pressure Minimum w.c. NG 3.5" - LP 8"
Included Package Contents Included Package Contents
AI-Si Heat Exchanger
3 Speed Grundfos Integrated Pump
Integrated Expansion Vessel -
FW200 Weather Compensation Control
Heatronic III - Control PCB
Hydronics Manifold Bracket with NPT Connection
Twin Pipe Flue Adapter
Tank Sensor
System Supply Sensor
NG / LP Conversion Kit
Condensate Trap Drain Hose






Limited Warranty

  • 5 year parts & labor
  • Lifetime heat exchanger