Coates Electric Pool Heater, 12kw 208V Three Phase

The Coates 12kW 208V Three-Phase Electric Pool & Spa Heater (Model 32012CE / 32012CPH) is a commercial-grade inline immersion water heater engineered for commercial hospitality spas, municipal plunge pools, health club hydrotherapy tanks, and athletic training facilities operating on a standard 208V 3-phase/4-wire commercial electrical network.

By distributing the 12kW heating load across three ungrounded phase conductors, the current draw per line is reduced by approximately 42% compared to single-phase equivalents, minimizing line losses, wire gauge requirements, and electrical panel congestion.

Electrical & Heating Performance

• Model Designation: Coates 32012CE / 32012CPH series (Prefix 320 designates 3-Phase, 208V).

• Heating Capacity: 12 kW (12,000 Watts).

• Thermal Output: 40,946 BTU/hr ($12\text{ kW} \times 3,412.142\text{ BTU/kWh}$).

• Operating Voltage: 208V AC, Three-Phase (3Ø), 3-pole / 3-wire plus ground (or 4-wire Wye), 60 Hz.

• Full Load Amperage (FLA): 33.3 Amps

  $$\text{FLA} = \frac{12,000\text{ W}}{208\text{ V} \times \sqrt{3}} = \frac{12,000}{360.26} \approx 33.31\text{ A}$$

• Overcurrent Protection (Breaker Sizing): Requires a dedicated 3-pole 45-Amp or 50-Amp circuit breaker conforming to NEC 125% continuous-duty branch requirements ($33.31\text{ A} \times 1.25 = 41.64\text{ A}$ minimum branch rating, standardizing on a 45A or 50A 3-pole breaker).

• Conductor Sizing: Minimum #8 AWG or #6 AWG THHN/THWN copper conductor (rated 75°C/90°C terminals, subject to conduit run distance and raceway fill derating).

Construction & Safety Architecture

• Pressure Vessel: Heavy-gauge, welded cylindrical steel/stainless steel pressure vessel treated with a high-temperature internal protective baked lining to resist aggressive water velocities, chemical corrosion, and galvanic erosion.

• Heating Elements: Commercial screw-plug immersion elements with heavy-duty Incoloy 800/825 or Titanium alloy sheathing, engineered for uniform heat dissipation and resistance to chemical pitting and scale accumulation.

• Cabinet & Enclosure: NEMA 1 industrial painted heavy-gauge steel enclosure featuring a removable front access panel for wiring terminations, contactor inspection, and terminal torque verification.

• Integrated Safety Controls:

  • Dual-dial adjustable thermostatic controller calibrated up to 104°F (40°C) for commercial spa compliance.

  • Manual-reset High-Limit safety cutout set to de-energize the magnetic contactor coil at 122°F (50°C).

  • Pressure/flow-interlock switch preventing heating element contactors from pulling in during low-flow, pump loss, or deadhead conditions.

Hydraulic & Plumbing Specifications

• Plumbing Connections: Standard 1-1/2" NPT female inlet and outlet ports.

• Flow Rate Parameters:

  • Minimum Flow Rate: 15 to 20 GPM (approx. 57 to 76 LPM) required to trip the flow switch and prevent localized thermal cavitation/boiling.

  • Maximum Flow Rate: 60 to 70 GPM (approx. 227 to 265 LPM); higher circulation filtration loops require an external plumbed bypass manifold.

• Maximum Working Pressure: 60 PSI (approx. 4.14 bar).

Dimensions, Net Weight & Shipping Weight

• Unit Dimensions: Approximately 19.5" L × 10.0" W × 14.5" H (approx. 49.5 cm × 25.4 cm × 36.8 cm).

• Net Unit Weight: Approximately 46 to 52 lbs (approx. 20.9 to 23.6 kg).

• Packaged Shipping Dimensions: Approximately 22" L × 13" W × 17" H.

• Packaged Shipping Weight: Approximately 58 to 66 lbs (approx. 26.3 to 29.9 kg) in heavy-gauge corrugated packaging with protective foam inserts.

Estimated Temperature Rise Rates

(Calculation: $\text{Rise (°F/hr)} = \frac{40,946\text{ BTU/hr}}{\text{Gallons} \times 8.34\text{ lbs/gal}}$, baseline heat-up rate assuming covered vessel without ambient radiation losses.)