Coates Electric Pool Heater, 15kw 240V Single Phase, Salt Water Application

The Coates 15kW 240V Single-Phase Electric Pool & Spa Heater for Salt Water Applications (Model 12415CES / 12415CPHS — designated with the "S" saltwater/corrosion-resistant package) is engineered for commercial hydrotherapy tanks, high-occupancy resort spas, and municipal plunge pools utilizing electrolytic salt chlorine generators (typically operating between 2,500 and 4,500+ ppm TDS/NaCl).

Because saline environments accelerate galvanic action and chloride pitting on conventional immersion heating elements, this unit integrates upgraded metallurgy and specialized barrier coatings to prevent premature element burnout and vessel degradation.

Electrical & Heating Performance

• Model Designation: Coates 12415CES / 12415CPHS series (124 designates 1-Phase 240V; suffix designates Saltwater/Titanium package).

• 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: 240V AC, Single-Phase (1Ø), 2-wire plus ground, 60 Hz.

• Full Load Amperage (FLA): 62.5 Amps

  $$\text{FLA} = \frac{15,000\text{ W}}{240\text{ V}} = 62.5\text{ A}$$

• Overcurrent Protection (Breaker Sizing): Requires a dedicated 2-pole 80-Amp circuit breaker conforming to NEC 125% continuous-duty branch requirements ($62.5\text{ A} \times 1.25 = 78.13\text{ A}$ minimum branch rating, standardizing on an 80A 2-pole breaker).

• Conductor Sizing: Minimum #4 AWG or #3 AWG THHN/THWN copper conductor (rated 75°C/90°C terminals, adjusted for ambient derating and run length).

Salt Water Construction & Metallurgy Upgrades

• Titanium / Incoloy 825 Sheathed Elements: Standard immersion elements are replaced with Titanium or high-nickel/high-molybdenum Incoloy 825 sheathing to withstand chloride-induced stress corrosion cracking (SCC), scale accumulation, and localized pitting from dissolved sodium chloride.

• Passivated / Coated Pressure Vessel: Extended cylindrical pressure chamber fabricated from heavy-gauge 316L stainless steel or carbon steel lined with a high-build baked phenolic epoxy/fluoropolymer protective barrier to isolate metal surfaces from saline electrolytic attack.

• Sacrificial Anode Protection: Includes an accessible sacrificial zinc or magnesium anode plug port to provide cathodic protection against stray currents and galvanic cell formation common in saltwater plumbing loops.

• Cabinet & Enclosure: NEMA 1 industrial painted heavy-gauge steel cabinet finished with a corrosion-inhibiting powder coat to resist airborne salt aerosols in humid mechanical rooms.

Construction & Safety Architecture

• Cabinet & Enclosure: NEMA 1 industrial painted steel cabinet with a removable front panel for terminal inspections, heavy-duty 2-pole magnetic contactor servicing, and field wire 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 (adapted via Schedule 80 CPVC unions).

• Equipment Sequencing in Salt Systems: Must always be installed upstream of the electrolytic chlorine generator cell (separated by a check valve where applicable) to prevent hyper-concentrated chlorine gas or acidic pockets from pooling inside the heater vessel during pump shutdowns.

• 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); 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 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-duty reinforced corrugated packaging.

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.)