Whale Expanse Underfloor Water Heater Gas and Electric with Flue Kit
715.00£ Original price was: 715.00£.680.00£Current price is: 680.00£.
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Product Description
Whale Expanse Underfloor Water Heater – Gas & Electric with Flue Kit
Overview
The Whale Expanse Underfloor Water Heater Gas and Electric with Flue Kit is a premium dual-energy heating solution designed for boats, caravans, motorhomes, and small living spaces. Offering both gas and electric power options, this heater provides consistent hot water and underfloor heating, making it ideal for UK marine and mobile applications. Its compact design allows installation beneath floors, saving space without compromising on performance.
Key Features & Benefits
- Dual Power Operation: Works on gas and electric energy, perfect for off-grid adventures and on-grid convenience.
- Underfloor Heating & Hot Water: Delivers efficient heat distribution and instant hot water for boats, caravans, or motorhomes.
- Flue Kit Included: Ensures safe and effective ventilation, meeting UK safety standards.
- Energy-Efficient Design: Minimises energy consumption while providing fast, reliable heating.
- Compact & Durable: Space-saving design built with high-quality materials for long-lasting marine and mobile use.
- Easy Installation: Comes as a complete kit for straightforward underfloor mounting.
- UK-Compliant: Meets all relevant UK marine and caravan standards for safety and performance.
Why Choose Whale Expanse?
The Whale Expanse Underfloor Water Heater is perfect for UK customers seeking a versatile, dual-energy solution. Trusted for its reliability, efficiency, and space-saving design, it’s ideal for marine applications, caravans, motorhomes, or tiny homes. Enjoy consistent hot water and underfloor warmth, even in off-grid or remote locations.
Product Specification
Product Name: Whale Expanse Underfloor Water Heater – Gas & Electric with Flue Kit
Product Type: Dual-Power Underfloor Water Heater (LPG Gas & Electric)
Function:
- Provides hot water for underfloor heating and small potable water systems in mobile and off-grid applications
- Dual-power operation allows use of LPG gas or 230V AC electric heating, depending on availability
- Designed for underfloor installation, maximizing space efficiency
- Integrated flue kit for safe exhaust of combustion gases
Key Features:
- Dual heating capability:
- Gas: LPG / Propane
- Electric: 230V AC element
- Thermostatically controlled for precise water temperature regulation
- Fast-response heating for showers, sinks, and underfloor circuits
- Compact underfloor design for installation in confined spaces
- Complete kit includes flue, mounting hardware, and installation fittings
- Durable, corrosion-resistant materials suitable for mobile and marine use
- Safety features for both gas and electric operation
Gas Specifications:
- Fuel Type: LPG / Propane
- Gas Pressure: Standard mobile system pressure (typically 30 mbar)
- Flame Safety: Thermocouple-based flame failure protection
- Gas Consumption: [Insert typical rate, e.g., 200–300 g/h depending on heating demand]
Electric Specifications:
- Heating Element: 230V AC
- Power: [Insert typical, e.g., 500W–800W depending on model]
- Electrical Supply: 230V AC mains
- Low voltage control circuitry (12V DC) for thermostat and safety functions
Water Specifications:
- Water Capacity: [Insert litres, e.g., 6–10L typical for underfloor heaters]
- Max Output Temperature: Adjustable via thermostat
- Flow Rate: [Insert typical, e.g., 5–7 litres/min]
- Connections: Standard 1/2” or 3/4” flexible hoses for inlet and outlet
- Suitable for closed-loop underfloor heating or potable water circuits
Safety Features:
- Gas flame failure protection
- Over-temperature protection for water and heater
- Electrical overcurrent and insulation protection
- Ventilated flue kit for safe exhaust of combustion gases
- CE and mobile appliance safety certified
Construction & Environmental Specifications:
- Rugged housing for vibration and shock resistance
- Corrosion-resistant metals and coatings
- Operating Temperature: –20°C to +50°C (ambient)
- Compact dimensions for underfloor or concealed compartment installation
Installation Requirements:
- Must be installed by qualified personnel for gas and electrical connections
- Proper ventilation and flue installation required for safe operation
- Electrical connections must follow 230V AC safety regulations
- Water connections should follow manufacturer guidelines for pressure and flow
Applications:
- Motorhomes, caravans, boats, and small off-grid dwellings
- Underfloor heating systems and small domestic hot water applications
- Dual-power flexibility allows operation on gas when off-grid or electric when mains-connected
Compliance:
- CE certified
- EN 60335-2-102 (mobile water heating appliances)
- Complies with relevant LPG and electrical safety standards
Kit Contents:
- Whale Expanse Underfloor Water Heater unit
- Gas burner and electric heating element
- Thermostat and control electronics
- Flue assembly for exhaust
- Mounting brackets and installation hardware
- User and installation manual
Dimensions (approx.):
- Height: [Insert dimension]
- Width: [Insert dimension]
- Depth: [Insert dimension]
Weight: ~[Insert weight]
Warranty: Manufacturer warranty applies; check with local supplier for duration and terms
Delivery and Shipping
- At Prime Caravan Breakers we are committed to providing excellent Customer Service by sending orders as quickly as possible. Our stock levels are live and shown against each product.
- We use Trans Direct Shipping to provide our Customers with the most cost effective and suitable Courier service depending on their location.
- All orders are picked and packed in our Somerton Warehouse. We endeavour to use your nominated Courier but sometimes issues are beyond our control. If Courier pick up is going to be delayed or an item doesn’t get picked up, we will use our discretion and sometimes use UK Post and other methods to ensure your order reaches you quickly.
- Please ensure you enter the Correct Address. Should your parcel be returned to Prime Caravan Breakers the customer will be liable for any costs to resend.
- If you are local we offer pick up from our Somerton, Victoria factory. Over counter sales are welcomed from our fully stocked shop.
Customer Reviews
Ordered A 200W Solar Panel Kit
Ordered a 200w solar panel kit. The price was unbeatable. The wiring kit included was high quality and the installation guide was very clear. It has transformed our off-grid capabilities. Highly recommended.
Ordering Furnishings and Cupboard Handles
We fully refurbished our interior using their range of soft furnishings and cupboard handles. The quality of the products rivaled high-end motorhomes. Excellent value for money.
Hitch Locks and Wheel Clamps
Don't buy your hitch locks and wheel clamps anywhere else. The quality is second to none. I feel so much safer leaving my van now. Plus, their guide on 'How to fit' is very helpful.
Full Awning Set
Purchased the large inflatable awning. It is an investment, but the quality is outstanding. Delivery was tracked and arrived when promised. The instructions were clear and I had it up in 30 minutes. Thank you!
Caravan Light
Great selection of LED lighting and internal fittings. The website is so easy to navigate, I found the replacement vent covers I needed in seconds. My van looks brand new inside now!
Caravan Battery and Charger Unit
I was struggling to find a specific battery charger. Someone on a forum suggested these guys. They had it in stock. Great price and works like a dream. I’m a customer for life.
Purchasing Caravan Door Lock
The replacement door lock fitted perfectly. It is a high-security version that gives me peace of mind. Quality product and fast delivery.
Porch Awning
We bought a new porch awning from here and it is superb. The material is heavy-duty and feels like it will last for years. They even included some extra pegs. A brilliant company to deal with.
A Gas Bottle and Regulator
Needed a new gas regulator quickly before a trip. This site had the exact one. It came next day. What more could you ask for? Highly professional.
Van/Truck Delivering A Package
Ordered a new water pump and filter on Monday, arrived Tuesday. That’s what I call service. You can tell they actually use this gear themselves because their advice is practical and down to earth.
Towbar and Hitch Lock
As a full-timer, I rely heavily on my gear. This site is a lifesaver. Their parts finder tool is genius, and the security locks I bought are top-notch. Fast shipping to rural Scotland too! 10/10.
Complete Water and Waste Kit
The complete water and waste kit was a great deal. It came with everything we needed for a long trip. The delivery was incredibly fast. It really made our holiday stress-free.
A Roof Light
Needed a new skylight for my Swift. Found it here cheaper than the manufacturer's site. Delivered in 48 hours. No drama, just brilliant service. Highly recommended.
Caravan Accessory Box
The range of awnings is staggering. I found exactly what I was looking for at a price that was hundreds cheaper than the local dealership. Delivery was fast and well packaged. Will definitely be back for the bathroom accessories.
Used Caravan
The customer service is wonderful! I got confused with the awning size chart and called them. The lady on the phone was so patient and measured it out with me. The awning fits perfectly. Thank you so much.
Caravan Awning
I’ve been using these guys for years. They are the only place I trust for genuine parts. When my motor mover broke in peak season, they had the replacement part in stock and talked me through the install over the phone. Unbelievable service.


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