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AT204510C Series-C Electric Boiler, 4-Element, 20kW (68,200 BTU)
Brand: Argo
Part#: AT204510C
made in usa
Usually ships: within 10-12 business days
Argo AT series C fully packaged hot water electric boiler for radiant floor heating, hydronic baseboard/radiator, solar and other applications.

  • Burnham: EB-20
  • Electro Industries: EB-MS-20
  • Stiebel Eltron: HSEB019
  • Thermolec: B-20U FFB-H

  • Made in the USA
  • Solid and time proven, 1-piece cast iron heat exchanger with 20-year warranty
  • 100% efficiency - no gas chimeny/vent pipe needed, zero emissions and no carbon monoxide
  • Ultra-compact, lightweight, wall-hung design
  • Ideal for radiant heating, baseboard and solar projects and applications requiring special temperature settings
  • Automatic cycling of heating elements (replaceable) for extended life
  • Advanced load management provides the option to allow your utility to remotely manage the boiler, reducing peak demands
  • Two separate temperature set points for heating and DHW
  • Built-in dry fire, brown out and freeze protection, replaceable fuses, operating limit & high limit protection, audible alarm
  • Connections for flow switch (optional), LWCO (optional), 3-wire (or 2-wire) thermostat and circulator pump (w/ exercise option)
  • LED display w/ button interface for easy programming & diagnostics

Technical Specifications:
  • Boiler Net BTU Rating: 68,200 BTU
  • Boiler Size (Watts): 20,000W
  • Voltage: 240V, 3-wire, 50/60 Hz, single-phase (can be used at 208V with reduced output - see manual for details)
  • Amps: 83.3A (Heating Elements), 6A (Pump/Accessory Load), 89.3A (Total)
  • Minimum Circuit Ampacity: 111.7A
  • Suggested Breaker Size: 125A
  • Recommended Copper Wire: 1/0 AWG (140F/60C), 2 AWG (167F/75C), 2 AWG (194F/90C)
  • Number of Heating Elements: 4
  • Heating Element Size: 5,000 Watts
  • Plumbing Connections: 3/4" NPT Supply & Return, Pressure Relief Valve, Air Vent and Flow Switch Tee; 1/4" NPT Temperature & Pressure Gauge
  • Water Temperature Heating Range: 90°F - 180°F (adjustable - for radiant, baseboards, etc.)
  • Max Pressure: 30 psi (relief valve setting)
  • Minimum Flow Rate (at 20°F rise): 6.8 GPM
  • Dimensions: 14-5/8" High x 18-5/8" Wide x 9" Deep
  • Weight: 70 lbs

20-year heat exchanger warranty, 1-year parts warranty.
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