Whale Expanse Balanced Flue Gas/Electric Water Heater

£459.17£558.33 ex. VAT

Please note that if replacing an existing Expanse the model number of your heater MUST match the part number shown in the SKU code, excluding the ‘SET’.

For example DW8212UR is NOT compatible with SET WL8212

From: £551.00 inc. VAT

SKU: SETWL82XXX Categories: ,


Whale Expanse logo

This 8 litre Caravan and motorhome water storage heater has been cleverly designed to maximise living space by being located outside under the vehicle if space allows, or internally, but by using a balanced flue to increase location options. This under floor water heater builds on Whales reputation for heating excellence gained by their award winning space heaters

Being balanced flue this now means the days of cutting large holes for Flues in the side of your motorhome is a thing of the past, with the concentric flue pipes being led to the side of the vehicle and discreetly hidden under the sill. For internal mounted version the exhaust can go down through the floor and then to the side of the vehicle as up two metres of exhaust run is available to play with.

When fitted alongside  a Whale or Propex Under Floor Space Heater you can create a total under floor water and space heating system to create even more open space and offer more versatility in interior layout designs.

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


Whale Expanse Balanced Flue Gas Water Heater For Motorhomes features:

  • Fits Internally or Under floor
  • Balanced flue up to 2 metres long
  • Gas only, Electric only or combined (Gas only version also available)
  • Selectable 750Watt or 1500Watt power setting
  • Easy to install
  • Space Saving
  • Fast and efficient


Rapid Heat Up, Reheat & Retention

The water tank’s highly efficient pre-mixed burner and direct heat exchanger are designed to optimise heat transfer. This 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 later. 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. A Gas only model is also available for those not needing the mains electric option.

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 has secure mounting points moulded in to ensure a secure fix to the bottom of the vehicle. Expanse includes an external gas connections. The built in fan-assisted flue means wall cut outs are no longer required,  Thus helping 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).


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

Additional information

Weight9 kg
Dimensions72 × 32 × 40 mm

Internal Mount G&E, Underfloor Mount G&E, Gas Only Underfloor