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The Whale Heat Air Underfloor Space Heater 3 kW Gas Only (SETSL3511A) is a compact, powerful gas heater designed specifically for campervans, motorhomes, and van conversions. Installed beneath the floor, it conserves valuable internal living space while delivering efficient, even heating throughout your vehicle.
Gas-Only Operation: Designed for use with butane/propane at 30 mbar — ideal for off-grid heating without mains electricity.
Underfloor Installation: Mounts under the van floor to maximise interior space and keep heater components out of the way.
Efficient Heating: Provides a 3 kW heat output to warm your living space quickly and comfortably.
Lightweight & Compact: At just 5.9 kg with a length of 469 mm, it’s easy to fit in tight spaces.
Quiet & Comfortable: Designed for smooth airflow and quiet operation while maintaining an even distribution of warm air.
Gas heater unit
Control panel
LIN cable & connector
Combustion air intake flue + silencer + clamp
Exhaust gas flue + clamp
Exhaust flue brackets (60 mm & 80 mm)
Exhaust flue end terminal bracket (100 mm)
Installation & operating instructions + warranty literature
2 × ducting reducers (90→65 mm)
| Brand | Whale |
| Type | Blown Air Heaters |
| Voltage Description | 10.1V - 15.9V DC |
| Model | 3GT |
| Height Description | 175mm |
| Width | 165 mm |
| Length | 469 mm |
| Weight | 5.9 kg |
| Fuel | Butane/Propane 30mbar |
| Heat Output | 3KW |
| Gas Consumption | 109, 239 g/h |
| Maximum Air Flow | @ 0.5mbar: 220 m3/h |
Must be installed and serviced by a qualified gas engineer in accordance with BS EN 1949 or relevant standards.
Underfloor installation preserves living space and allows flexible ducting layouts.
Space-Saving: Underfloor fitting frees up interior volume — perfect for compact vans.
Efficient & Quiet: Elevated comfort without noise intrusion.
Reliable Brand: Whale heating systems are well-regarded in the caravan and campervan market.
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