Coates Electric Pool Heater, 12kw 600V Three Phase

The Coates 12kW 600V Three-Phase Electric Pool & Spa Heater (Model 36012CE / 36012CPH) is a specialized commercial-grade inline immersion water heater designed specifically for Canadian commercial aquatic facilities, industrial sites, and institutions operating on a standard 600V 3-phase electrical distribution service.

By utilizing high-voltage 600V three-phase power, the unit operates at an extremely low current draw of just 11.5 Amps, enabling minimal conductor sizes, negligible line losses, and minimal panelboard space requirements compared to 208V or 240V installations.

Electrical & Heating Performance

• Model Designation: Coates 36012CE / 36012CPH series (Prefix 360 designates 3-Phase, 600V).

• 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: 600V AC, Three-Phase (3Ø), 3-wire plus ground, 60 Hz.

• Full Load Amperage (FLA): 11.5 Amps

  $$\text{FLA} = \frac{12,000\text{ W}}{600\text{ V} \times \sqrt{3}} = \frac{12,000}{1,039.23} \approx 11.55\text{ A}$$

• Overcurrent Protection (Breaker Sizing): Requires a dedicated 3-pole 15-Amp or 20-Amp circuit breaker (600V-rated) to satisfy continuous-duty loading requirements ($11.55\text{ A} \times 1.25 = 14.44\text{ A}$ minimum branch rating, standardizing on a 15A or 20A 600V 3-pole breaker).

• Conductor Sizing: Minimum #12 AWG or #14 AWG THHN/THWN/RW90 copper conductor (rated 600V insulation, standard minimum branch circuit wiring).

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 flow and aggressive sanitizing chemicals.

• Heating Elements: Heavy-duty screw-plug commercial immersion elements rated for 600V operation, sheathed in premium Incoloy 800/825 or Titanium alloy to resist pitting, scale accumulation, and chemical erosion.

• Cabinet & Enclosure: NEMA 1 industrial painted heavy-gauge steel cabinet with a removable front access panel for terminal inspections, 600V-rated magnetic contactor servicing, and field wiring terminations.

• Internal Control Circuit: Typically incorporates an internal step-down control transformer (600V primary to 120V/24V secondary) to power the thermostats and safety interlock circuit.

• 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 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 safety flow switch and prevent localized boiling.

  • 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 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 carton packaging with dense molded 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.)