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FS Series Condensing Combi Gas Floor Boiler

Combi (combination) unit with space heating and integrated water heating in one highly efficient' compact unit. 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.

  • 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.
  • High-strength stainless steel secondary exchanger and burner with double passage - ensuring consistent temperature output based on demand. The DHW hot water temperature control limit of 140°F helps prevent scale build-up within the heat exchanger.
  • Full modulating fan automatically increases or decreases its speed according to the amount of gas coming into the boiler depending on the heat demand.
  • Simple' intelligent control options optimize efficiency and fuel consumption
  • Electronic ignition
  • 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
MODELInput MBtuHOutput MBtuHAFUEDimensions
HxWxD
Water Content
Gal.
Weight
Lbs.
DHW FLOW MAX GPM
KWB42-3152.0 135.0 95.0 41.25x23.9x21.9 0.93 137 4.0
KWB28-3101.0 91.0 95.0 41.25x23.9x21.9 0.93 137 2.65
KWB35-3135.0 118.0 95.0 41.25x23.9x21.9 0.93 137 3.2

Warranty Information

  • All Parts for 60 months - With Prompt Registraion
  • Heat Exchanger - Limited Lifetime

Available Documents

  • 216-20107.pdf (Color, Consumer Literature)
  • 216-20109.pdf (In the Box, Service Information, Installation & Operation, Service Guide)

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