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Suitable for extensions, loft conversions, conservatories and garages where space is at a premium.


Electric flow boiler which provides hot water to the wet central heating system. Suitable for pressurised or open vented systems and with no flue or heat wasted up the chimney.

Amptec works in conjunction with standard radiators, programmers, circulating pumps, room thermostats and thermostatic radiator valves to heat water for radiator or underfloor heating systems. Available in a range of kW sizes.

Features and benefits:

  • Lightweight, compact and unobtrusive.
  • Provides diagnostic reporting for product status and fault finding.
  • Controllable, efficient wet central heating.
  • Uses standard radiators, programmer, pump, room thermostat and thermostatic radiator valves.
  • Suitable for pressurised or open vented systems.
  • Models are available for underfloor heating systems.
  • Provides domestic hot water from the boiler in conjunction with an indirect cylinder or separate direct cylinder.
  • No flue and no fuel tanks allow flexible installation location.
  • 99.8% efficiency.
  • Ease of installation.
  • Silent operation.
  • The boiler has a front panel indication to show boiler state.
  • Solid state technology with no moving parts for long life.
  • Soft start and zero volt switching to avoid power surges.
  • Minimum/ maximum control adjusts the water temperature output from the boiler.
  • Minimal service and maintenance costs.
  • No requirement for an annual safety certificate - consult manufacturer for details.
  • Two-year on-site parts and labour warranty.
  • Designed, engineered and manufactured in the UK.
  • Fully Energy related Products (ErP) compliant, CE marked and Nemko approved.


Suitable for extensions, loft conversions, conservatories and garages where space is at a premium.

General information
Specification data - Electric boilers
Product Reference

Amptec C400 Standard

4 kW output.

Amptec C600 Standard

6 kW output.

Amptec C900 Standard

9 kW output.

Amptec C1100 Standard

11 kW output.

Amptec C1100 Standard

11 kW output.

Amptec U401 Underfloor

4 kW output.

Amptec U601 Underfloor

6 kW output.

Amptec U901 Underfloor

9 kW output.

Amptec U1101 Underfloor

11 kW output.

Amptec U1201 Underfloor

12 kW output.



Relay RL1

Relay RL2

Relay RL3

Standard product features

Size (h x w x d):

1050 x 90 x 90 mm.

Weight (empty):

  • Amptec C400 Standard: 7.3 kg.
  • Other standard models: 7.5 kg.
  • Underfloor models: 8.5 kg.

Energy related Products (ErP) rating:


Technical characteristics:

  • Electrical supply voltage: 220–240 V.
  • Electrical supply frequency: 50 Hz.
  • 240 V/Btu: 4 kW models: 13 600; 6 kW models: 20 400; 9 kW models: 30 700; 11 kW models: 37 500; 12 kW models: 40 900.
  • Over temperature trips: 95ºC and 100ºC.
  • Water content: 1.3 L.
  • Recommended Δt (temperature difference) across boiler: 5–10ºC.
  • Maximum operating pressure: 3 bar.
  • Output temperature control range: Standard models: 65–80ºC; Underfloor models: 30–60ºC.
  • Minimum flow rate: 4–6 kW models: 6 L/min; 9–12 kW models: 12 L/min.
  • Seasonal space heating energy efficiency class: D.
  • Seasonal space heating energy efficiency: 37%.
  • Annual energy consumption: Amptec C400 Standard: 8661 kW/h; Amptec C600 Standard: 12 986 kW/h; Amptec C900 Standard: 19 472 kW/h; Amptec C1100 Standard: 23 796 kW/h; Amptec C1200 Standard: 25 958 kW/h.

Third party certifications
  • Nemko: Certificate: P12215619 : N-Mark Certification
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