Whale Underfloor Space Heater 4.3kW Gas and Electric ISO Bulk - AK1937

Whale Underfloor Space Heater 4.3kW Gas and Electric ISO Bulk - AK1937

Please note the lead time on this item is approx 6 weeks

The Whale Underfloor Space Heater 4.3kW Gas & Electric ISO Bulk — AK1937 is a compact blown-air underfloor heater engineered for caravan and motorhome heating applications. It combines gas and electric heat sources to provide efficient warm air distribution through a ducted system, helping keep your leisure vehicle comfortable in cooler weather. This unit is not suitable for static caravans or fixed buildings.

Designed with a boost setting, the heater automatically adjusts heat output based on interior temperature for more effective performance.

Where It Fits

This heater is intended to be installed beneath the floor (underfloor) of a caravan, campervan, or motorhome habitation area, external to the living space. From this position it feeds warm air into ductwork that rises through the floor and out through vents around the interior, ensuring even heat distribution throughout the living space.

⚠️ Installation involves gas and mains electricity and must be carried out by a qualified/competent installer in accordance with gas and electrical regulations.

Key Features

• 🔥 Dual Fuel Heating: Uses both gas and electric inputs for flexible heating.

• ⚡ Boost Setting: Varies output automatically based on internal vehicle temperature.

• 💨 Blown Air Output: Warm air is distributed efficiently via underfloor ducting.

• 🚐 Underfloor Installation: Saves interior space while providing effective heating.

• 📊 Control Panel Compatibility: Works with Whale Space Heater Control Panel, Duo Control Panel, or iVan Touchscreen Control Panel.

Technical Specifications

• Brand: Whale

• Part Number: AK1937

• Type: Underfloor Blown-Air Space Heater

• Nominal Heat Input: ~2.9 kW (gas) / ~2.6 kW (electric)

• Combined Use: Gas 2.9 kW + Electric up to ~1.3 kW simultaneously

• Fuel: Butane/Propane 28–30 mbar – CAT I3B/P (30)

• Duct Diameter: 60 mm ID (hot-air), 22 mm ID (flue)

• Voltage: 12 V DC control; 230 V AC electric heating

• Weight: ~10.9 kg

• Dimensions: Approx. 185 mm H × 313.5 mm W × 820 mm D

• Gas Consumption: ~220 g/hr

• Colour: Silver

• Control: Compatible with Whale interior control panels

Typical Uses

✔ Provides efficient central heating for caravan and motorhome interiors
✔ Supports both gas and electric heating modes
✔ Distributes warm air through ducted vents throughout the living area
✔ Ideal for year-round use in cold weather when paired with a suitable control panel

Why Buy This Heater?

• ✔ Genuine Whale OEM quality engineered for leisure vehicles

• ✔ Dual-mode heating flexibility – gas and electric ready

• ✔ Compact underfloor design optimises interior space

• ✔ Automatic boost control maximises heating efficiency

• ✔ Professional HVAC performance when correctly installed

Using the correct underfloor heater ensures your caravan or motorhome stays warm and comfortable no matter the conditions, with reliable performance and even airflow distribution.

• Installation: Professional / qualified installer required

Pro tip

Underfloor heaters perform best when duct runs are short and well balanced. Seal all floor penetrations thoroughly to prevent drafts, moisture ingress, and road noise.