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Heating FH3

The Grayson FH3 is a compact 24V DC floor-mounted heater engineered to provide dependable passenger saloon heating in heavy vehicle applications. Delivering up to 18kW of heating output via a long-life brushless blower, the FH3 supports consistent cabin warmth in cold conditions. Its robust, service-friendly design and flexible configuration make it suitable for a wide range of vehicle layouts.

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Overview

The FH3 floor heater delivers high-capacity passenger heating for buses, coaches and heavy vehicles operating in low ambient temperatures.

Powered by a 24V DC supply, the unit provides up to 18kW of heat to maintain stable and comfortable saloon conditions throughout winter operation. A long-life brushless blower ensures consistent airflow, while the integrated easy-clean filter supports straightforward maintenance and reliable long-term performance.

Designed for floor installation with right-hand pipe orientation, the FH3 offers efficient heat distribution and simple integration into existing HVAC layouts. Its slightly more compact footprint makes it well suited to installations where space or packaging constraints apply.

Features

This product brings together features that support multiple operational use-cases.

  • 18kW Heating Output: Provides strong, consistent heating for passenger saloons in cold climates.
  • 24V DC Operation: Compatible with common heavy-duty vehicle power architectures.
  • Long-life Brushless Blower: Delivers reliable airflow with reduced wear and maintenance.
  • Single Blower Speed: Simplifies system control and electrical integration.
  • Easy Clean Filter: Enables quick servicing and sustained heating performance.
  • Floor-Mounted Design: Supports even heat distribution across the passenger area.
  • Right-Hand Pipe Orientation: Simplifies plumbing and installation.
  • Configurable Design: Supports tighter packaging requirements within vehicle interiors.
Technical

Every technical element plays a role in delivering reliable and predictable system performance.

  • Heating Output: 18kW
  • Supply Voltage: 24V DC
  • Dimensions (L x W x D): 497 × 254 × 221 mm
  • Blower: Long-Life Brushless Blower
  • Blower Speed: 1
  • Filter: Easy-Clean Filter
  • Orientation: Right-Hand Pipes
  • Mounting: Floor
Heating Output

18kW

Maintains comfortable passenger temperatures during winter operation.
Voltage Supply

24V DC

Designed for seamless integration into heavy vehicle electrical systems.
Blower

Brushless

Ensures consistent airflow and long service life.
Mounting

Floor

Ideal for applications with limited available space.
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Compatible Applications

Product Benefits​

Discover why the world’s bus and coach OEMs choose the FH2 Heater to deliver reliable cabin comfort.

Assured Passenger Comfort

High heating output ensures warm, stable saloon conditions in cold weather.

Space-Efficient Design

Compact dimensions support installations with tighter packaging constraints.

Reduced Maintenance Requirements

Brushless blower and easy-clean filter minimise downtime and servicing effort.

Straightforward Integration

Single-speed blower and 24V DC supply simplify HVAC system design.

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Our Capabilities

Full lifecycle support for OEMs

Grayson offers end-to-end design, testing, manufacturing and integration expertise to deliver tailored heating solutions for demanding vehicle applications. Learn More

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Discover More About Grayson

For over four decades, Grayson Thermal Systems has provided innovative heating and cooling solutions to vehicle operators worldwide. Our expertise ensures dependable operation and long-term system efficiency.