Coates Electric Pool Heater, 45kw 240V Single Phase

The Coates 45kW 240V Single-Phase Electric Pool & Spa Heater (Model 12445CE / 12445CPH) represents an extreme, high-output commercial electric immersion configuration engineered for large commercial hydrotherapy spas, municipal therapy pools, swim-school vessels, and fitness center warm-water tanks where fossil-fuel combustion and flue-gas venting are prohibited or mechanically unfeasible.

Operating 45kW on a single-phase 240V supply demands substantial electrical infrastructure. To manage terminal heat and comply with the National Electrical Code (NEC), Coates utilizes a multi-stage magnetic contactor design with sub-divided internal heating banks.

Electrical & Heating Performance

• Model Designation: Coates 12445CE / 12445CPH series.

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

• Full Load Amperage (FLA): 187.5 Amps ($45,000\text{ W} / 240\text{ V} = 187.5\text{ A}$).

• Overcurrent Protection (Breaker Sizing): Requires a total branch protection capacity of 235 to 250 Amps under NEC 125% continuous-duty mandates ($187.5\text{ A} \times 1.25 = 234.38\text{ A}$).

  • Standard Multi-Feed Branch Setup: Single-phase loads of this magnitude cannot terminate safely on a single small contactor. The unit is typically configured for split multi-circuit supply:

    • Three independent 80A / 2-Pole branch circuits (each powering a 15kW element bank at 62.5A continuous load: $62.5\text{ A} \times 1.25 = 78.13\text{ A}$ minimum breaker rating), OR

    • Four independent 60A / 2-Pole branch circuits (depending on the internal element cluster division).

• Conductor Sizing (Copper Only, 75°C/90°C THHN/THWN):

  • Three-Circuit Split: Three independent runs of #3 AWG or #2 AWG copper.

  • Four-Circuit Split: Four independent runs of #6 AWG or #4 AWG copper.

  • Main Subpanel Feeder (if feeding a local distribution panel): Minimum 250 kcmil or 300 kcmil copper (or parallel runs) on a dedicated 250A distribution panelboard.

Construction & Safety Architecture

• Pressure Vessel: Heavy-gauge, welded cylindrical steel/stainless steel vessel with an internal protective baked lining engineered to resist erosion, galvanic action, and aggressive commercial chemical treatment.

• Heating Elements: Heavy-duty screw-plug immersion elements with low-watt-density Incoloy 800/825 or Titanium alloy sheathing to resist pitting, scale buildup, and high thermal stress.

• Cabinet & Enclosure: NEMA 1 industrial painted heavy-gauge steel cabinet with dual or full-front service doors for multi-stage contactor inspection, wiring terminations, and routine lug torque checks.

• 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 control contactors at 122°F (50°C).

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

Hydraulic & Plumbing Specifications

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

• Flow Rate Parameters:

  • Minimum Flow Rate: 25 to 30 GPM (approx. 95 to 114 LPM) required to satisfy the flow switch and prevent localized thermal cavitation/boiling over the 45kW element bank.

  • 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 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 reinforced corrugated packaging with dense molded foam inserts.

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.)