Coates Electric Pool Heater, 45kw 208V Three Phase

The Coates 45kW 208V Three-Phase Electric Pool & Spa Heater (Model 32045CE / 32045CPH) is a high-output, commercial inline immersion heater engineered for high-demand municipal therapy pools, swim schools, resort aquatic complexes, and commercial wellness centers operating on a standard 208V 3-phase/4-wire distribution service.

Operating across three balanced 208V phase legs distributes the massive 45kW thermal envelope to approximately 125 Amps per line, enabling facilities to achieve rapid recovery rates while staying within standard commercial 3-pole distribution gear.

Electrical & Heating Performance

• Model Designation: Coates 32045CE / 32045CPH series (320 designates 3-Phase, 208V).

• Heating Capacity: 45 kW (45,000 Watts).

• Thermal Output: 153,546 BTU/hr ($45\text{ kW} \times 3,412.142\text{ BTU/kWh}$).

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

• Full Load Amperage (FLA): 124.9 Amps

  $$\text{FLA} = \frac{45,000\text{ W}}{208\text{ V} \times \sqrt{3}} = \frac{45,000}{360.26} \approx 124.91\text{ A}$$

• Overcurrent Protection (Breaker Sizing): Requires a dedicated 3-pole 160-Amp or 175-Amp circuit breaker conforming to NEC 125% continuous-duty loading standards ($124.91\text{ A} \times 1.25 = 156.14\text{ A}$ minimum branch rating, standardizing on a 175A 3-pole breaker).

• Conductor Sizing: Minimum #2/0 AWG THHN/THWN copper conductor (rated 75°C/90°C terminals, adjusted for ambient temperature, raceway fill, and conduit distance).

Construction & Safety Architecture

• Pressure Vessel: Heavy-gauge, welded cylindrical steel/stainless steel pressure vessel treated internally with a baked corrosion-resistant protective coating to endure continuous commercial water velocity and aggressive sanitizing chemicals.

• Heating Elements: Commercial screw-plug immersion elements sheathed in premium Incoloy 800/825 or Titanium alloy, engineered to prevent chemical pitting, scaling, and high thermal stress across multi-bank configurations.

• Cabinet & Enclosure: NEMA 1 industrial painted heavy-gauge steel cabinet with a removable front access panel for terminal inspections, staged 3-pole magnetic contactor servicing, and line terminations.

• 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 control circuit 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 (typically adapted via Schedule 80 unions into 2" or 2-1/2" CPVC headers).

• Flow Rate Parameters:

  • Minimum Flow Rate: 25 to 30 GPM (approx. 95 to 114 LPM) required to trip the safety flow switch and prevent localized thermal cavitation.

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

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

Dimensions, Net Weight & Shipping Weight

• Unit Dimensions: Approximately 24.0" L × 12.0" W × 16.5" H (approx. 61.0 cm × 30.5 cm × 41.9 cm).

• Net Unit Weight: Approximately 82 to 90 lbs (approx. 37.2 to 40.8 kg).

• Packaged Shipping Dimensions: Approximately 26" L × 15" W × 19" H.

• Packaged Shipping Weight: Approximately 96 to 108 lbs (approx. 43.5 to 49.0 kg) in heavy-duty reinforced corrugated carton packaging with dense molded foam protection.

Estimated Temperature Rise Rates

(Calculation: $\text{Rise (°F/hr)} = \frac{153,546\text{ BTU/hr}}{\text{Gallons} \times 8.34\text{ lbs/gal}}$, baseline heat-up rate assuming covered vessel without ambient radiation losses.)