The Koller 953-0.5H inline heater provides water heating in hot tubs and wellness systems. The plastic housing guarantees a long service life and minimal maintenance.
The model combines a safety thermostat with a flow switch. The universal voltage range of 220–240 V requires specifying the corresponding output range. The package includes 2 couplings Ø 50 mm (858).
Technical parameters
- Mains voltage: 220–240 V, 50/60 Hz
- Total output: 450–550 W
- Protection rating: IP X5
- Total length: 217 mm (without couplings)
- Cable length: 2 m with terminals (supply line) + 2 m with terminals (control line)
- Variant: safety thermostat and flow switch
- Weight: 1.3 kg
- Housing: plastic
- Included in delivery: 2 couplings Ø 50 mm (858)



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