Coates Electric Pool Heater, 12kw 240V Single Phase

The Coates 12kW 240V Single-Phase Electric Pool & Spa Heater (Model 12412CE / 12412CPH) is a commercial-grade, inline electric immersion heater engineered for commercial spas, hotel plunge pools, therapy tanks, and small aquatic facility applications requiring precise, zero-emission water heating without venting or gas supply infrastructure.

Electrical & Heating Performance

• Model Designation: Coates 12412CE (or 12412CPH series).

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

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

• Operating Voltage: 240V AC, Single-Phase (1Ø), 60 Hz.

• Full Load Amperage (FLA): 50 Amps ($12,000\text{ W} / 240\text{ V} = 50\text{ A}$).

• Recommended Circuit Breaker: 60-Amp or 70-Amp double-pole dedicated breaker (conforming to NEC 125% continuous duty rating: $50\text{ A} \times 1.25 = 62.5\text{ A}$ minimum branch rating, standardizing on a 70A breaker or local AHJ code requirements).

• Wire Sizing: Minimum #4 AWG or #3 AWG THHN/THWN copper conductor (rated 75°C/90°C, subject to run distance and conduit derating).

Construction & Material Architecture

• Pressure Vessel: Heavy-gauge, welded cylindrical tank fabricated from high-grade structural steel or solid 304/316 stainless steel with a protective internal lining designed for high-pressure commercial water systems.

• Heating Elements: Screw-plug or flanged commercial immersion elements featuring Incoloy 800/825 or Titanium-sheathed alloys to withstand elevated chlorine, bromine, and commercial water sanitizers.

• Control Housing: NEMA 1 industrial-grade painted steel enclosure with front access panel for wiring, element inspection, and routine terminal torque verification.

• Thermostatic Controls: Dual-dial precision mechanical or digital thermostat adjustable up to 104°F (40°C) for commercial spa compliance, coupled with a manual-reset High-Limit safety switch cut-off set at 122°F (50°C).

• Flow Protection: Integrated interlocked flow switch / pressure switch ensuring heating elements cannot energize without positive water circulation, preventing dry-fire element burnout.

Hydraulic & Plumbing Specifications

• Plumbing Connections: Standard 1-1/2" NPT female inlet and outlet ports (or union adaptors for 1-1/2" to 2" PVC/CPVC schedule 80 plumbing).

• Water Flow Range:

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

  • Maximum Flow Rate: 60 to 70 GPM (approx. 227 to 265 LPM); higher pump flow volumes require a plumbed external bypass manifold.

• Maximum Working Pressure: Rated for up to 60 PSI (approx. 4.14 bar).

Dimensions, Weight & Logistics

• 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 45 to 52 lbs (approx. 20.4 to 23.6 kg).

• Packaged Shipping Weight: Approximately 56 to 65 lbs (approx. 25.4 to 29.5 kg).

• Shipping Profile: Compact carton packaging; ships via standard ground parcel or palletized LTL if ordered alongside larger commercial treatment units.

Sizing and Temperature Rise Estimates

(Formula applied: $\text{Temp Rise (°F/hr)} = \frac{40,946\text{ BTU/hr}}{\text{Gallons} \times 8.34\text{ lbs/gal}}$, excluding surface evaporation and wind heat losses.)