Coates Electric Pool Heater, 15kw 208V Three Phase

The Coates 15kW 208V Three-Phase Electric Pool & Spa Heater (Model 32015CE / 32015CPH) is a commercial-grade inline immersion water heater engineered for commercial spas, resort plunge pools, physical therapy tanks, and fitness club facilities supplied by a standard 208V 3-phase commercial electrical distribution network.

Operating across three phase conductors balances the 15kW heating load, drawing just over 41 Amps per line—substantially reducing conductor cross-section requirements and heat buildup compared to single-phase equivalents.

Electrical & Heating Performance

• Model Designation: Coates 32015CE / 32015CPH series.

• Heating Capacity: 15 kW (15,000 Watts).

• Thermal Output: 51,182 BTU/hr ($15\text{ kW} \times 3,412.142\text{ BTU/kWh}$).

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

• Full Load Amperage (FLA): 41.6 Amps

  $$\text{FLA} = \frac{15,000\text{ W}}{208\text{ V} \times \sqrt{3}} = \frac{15,000}{360.26} \approx 41.64\text{ A}$$

• Overcurrent Protection (Breaker Sizing): Requires a dedicated 3-pole 60-Amp circuit breaker conforming to NEC 125% continuous-duty loading standards ($41.64\text{ A} \times 1.25 = 52.05\text{ A}$ minimum branch rating, standardizing on a 60A 3-pole breaker).

• Conductor Sizing: Minimum #6 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 chamber treated internally with a baked corrosion-resistant protective lining to endure high flow velocities and aggressive commercial chemical sanitizers.

• Heating Elements: Screw-plug commercial immersion elements sheathed in premium Incoloy 800/825 or Titanium alloy to resist pitting, chemical attack, and scale accumulation.

• Cabinet & Enclosure: NEMA 1 industrial painted heavy-gauge steel enclosure featuring a removable front access panel for line terminations, 3-pole magnetic contactor servicing, 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 switch set to interrupt the contactor control circuit at 122°F (50°C).

  • Pressure/flow-interlock switch preventing heating element contactors from energizing during zero-flow, deadhead, or pump shutdown 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 internal safety flow switch.

  • Maximum Flow Rate: 60 to 70 GPM (approx. 227 to 265 LPM); higher circulation filtration loops mandate 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 48 to 54 lbs (approx. 21.8 to 24.5 kg).

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

• Packaged Shipping Weight: Approximately 60 to 68 lbs (approx. 27.2 to 30.8 kg) in heavy-gauge corrugated carton with protective foam inserts.

Estimated Temperature Rise Rates

(Calculation: $\text{Rise (°F/hr)} = \frac{51,182\text{ BTU/hr}}{\text{Gallons} \times 8.34\text{ lbs/gal}}$, baseline heat-up rate assuming covered vessel without ambient radiation losses.)