Energy Kinetics 90+ Resolute

90+ Resolute is ideal for fin tube baseboard, cast iron radiators, air handlers, and unit heaters, complementing its exceptional performance with high efficiency and nearly endless hot water. Save on energy costs without cutting back on comfort!

Top Performing System

UP to 91% AFUE

Higher Efficiency

Fuel Types: Oil, Natural Gas, Propane

Residential Use


  • Whisper Quiet
  • Endless Hot Showers
  • Proudly Made in USA
  • Industry leading efficiency
  • Exceptionally clean burning
  • Easily piped to multiple zones
  • Multi-fuel (easy to convert from oil to natural gas or propane)
  • 5 zone control, upgrade to 12 zones including hot water
  • ASME certified construction
  • Outside combustion air connection
  • Cuts up to 40% or more off the home heating bills
  • Gas protection alarm included with every gas systems
Product Guide EK

Learn More About Energy Kinetics 90+ Resolute

Energy Efficiency

Exceptional Energy Efficiency


Non-condensing boiler that sidewall vents or vents through your existing chimney without an expensive stainless steel liner.

The Department of Energy’s Brookhaven National Labs study demonstrates this design as the top performing system, saving up to 38% over boilers from around the world. The 90+ Resolute improves on the highest real efficiency of all systems tested, delivering even better peak and annual efficiency.

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