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Expanse Balanced Flue Gas Water Heater For Motorhomes

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The Whale Expanse, An Innovation in Water Heating

Balanced flue motorhome water heater

Balanced Flue Gas Water Heater For Motorhomes

The heat is on for vehicle converters today with the launch of the Whale Expanse, an innovative and exciting new Balanced Flue Gas Water Heater For Motorhomes from Whale®.

Whale’s new heater has been cleverly designed to maximise living space whilst adding improved functionality. This under floor water heater builds on their reputation for heating excellence gained by their award winning space heaters designed to be installed under vehicles.

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Introducing the Whale Expanse…

After many years of rigorous research, development and testing, Whale’s new, balanced flue, Gas and Electric Water Heater is ready to ignite a revolution in the motorhome industry. The extensive design process afforded the registration of 3 new patents to the Whale in-house team. This labour of love has created a totally ground breaking and innovative water heater. Offering more space, faster heat up and more control than any previous model, the Expanse can be mounted internally or externally under the floor. In an industry first, Expanse can be fitted alongside a Whale or Propex Under Floor Space Heater to create the only total under floor gas and electric water and space heating system on the market. With this complete system, Whale deliver high performance, create even more open space and offer more versatility in interior layouts.

Space Saving by Design

By locating the Whale Expanse™ beneath the vehicle, vehicle converters will now be able to create some truly grand interior designs. The increased living and storage space will afford them even more room for creativity and practicality. Fitted externally, Expanse only requires a minimal amount of internal space (214mm x 60mm x 81mm). Fitted internally, the heater gives converters the freedom to install hot water without resorting to cutting holes through motorhome bodywork.

Water heater for motorhomes

Water heater for motorhomes


A Revolution for the Industry

Expanse can be fitted alongside a Whale or Propex Under Floor Space Heater. The only complete under floor gas and electric water and space heating system.

Whale Expanse logo

Whale Expanse Balanced Flue Gas Water Heater For Motorhomes features:

  • Fits Internally or Under floor
  • Balanced flue
  • Gas, Electric or combined
  • Easy to install
  • Space Saving
  • Fast and efficient

Propex are delighted to be associated with Whale
For more information on this news story or Whale products, please contact us via email: or telephone: +44 (0)1425 486950.

Rapid Heat Up, Reheat & Retention

The water tank’s highly efficient pre-mixed burner and direct heat exchanger are designed to optimise heat transfer. The Expanse will heat water faster than any other model. In 11 minutes it will produce enough hot water for a 14 litre shower. A second shower can be taken just 8 minutes afterwards. 2 showers in just 19 minutes! The protective lightweight plastic outer housing and custom expanded polystyrene provide efficient insulation for the water tank. All designed to keep water hotter, for longer.

A Truly Versatile Water Heater

Expanse can run on electric only, gas only or both combined.

Simplified and Eased Installation with Maximised Freedom

Vehicle converters will enjoy the freedom to choose from a variety of internal or under floor chassis mounting locations thanks to the versatile design of the Expanse. The resilient outer housing is pre-moulded with secure mounting points to ensure a long term secure fit. Expanse includes external gas connections and a fan-assisted flue which is attached to the underside of the heater to minimize wall and floor cut outs. This helps to ensure that the overall vehicle structure remains intact and installation time is reduced. Installation is further streamlined thanks to Expanse’s unique integrated Pressure Relief Drain Valve and easy connection to Whale Quick Connect 12mm plumbing (adaptors are also available for all other typical plumbing systems).

More Heat, More Control, More Space and Reduced Heat up Times

Whale Managing Director Patrick Hurst added:

Expanse is truly a game changer, an industry first; and one of the most exciting products that Whale has ever brought to market. By designing this unique Water Heater to fit under vehicles we offer manufacturers greater flexibility for designing layouts, maximizing usable living areas and valuable storage space. This new design delivers Whale’s fastest water heat up and reheat times yet.

Our design ethos at Whale is to strive to offer the most innovative RV heating systems possible.

Expanse is a unique and exciting product in its own right, however by creating innovative products designed to work together we are able to deliver a revolutionary new heating package. The industry’s first under vehicle gas and electric water and space heating system. This complete system offers vehicle manufacturers faster installation times thanks to reduced wiring and fewer cut outs being required, as well as optimised interior layouts possible by locating both heaters under the vehicle. With this new innovative system, Whale offers the van user, more space, faster water heat up, more heat and the highest level of control in the company’s history. It is one of the most proud moments in the company’s 204 years!
~ Patrick Hurst, Managing Director Whale


Whale Expanse Dimensional Drawings

Whale Expanse Water Heater Side View Dimensions

Side View

Whale Expanse Water Heater End Dimensions

End View

Whale Expanse Water Heater Top Dimensions

Top View