Water Sensor, Compatible Manufacturer Part Number A39790-001, Detector Type Water Sensor.
eBay
This bypass kit for pool solar heating s is highly with efficient performance, which can easily connect multiple pool heaters at once for more abundant solar energy to up the heating of the pool water.
eBay
Sensor technique are: A. 1 x Pool Heater. Once unexpected high temperature 60℃（140℉）occurs, the temperature switch cuts off the system. Start the circulation pump for at least 2 minutes before turn on the heater, and turn off the circulation pump at least 2 minutes after turn off the heater.
eBay
Features: Material: 304 stainless steel Output: 200 kBtu/hour Heat transfer area: 4.8 square feet Hot water flow rate: 30 L/min Cold water flow: 250 L/min Side of hot water pipe: 1" FPT Same side port: 1 1/2" FPT Packing size: 54*19*19cm Product Size: 48.5*14cm/19.09*5.5inch Weight: 5.2kg The package includes: 1 x stainless steel heat exchanger 2 x fixed bracket.
eBay
This product is great for use with boilers, a solar pool heating system, and more. Shell (Pool) / Tube (Hot) Connections: 1 1/2" FPT / 1" FPT. Pool heating capacity up to 4,000 gallon 55 kBtu/hr fresh pool based on 60°C (140°F) temperature difference between incoming heating and heated water.
eBay
Part #: 28685E. MPN 28685E. Increases temperature of the pool water by approx. 5 to 9 degrees depending on weather. Eco-friendly solar technology. Simple hook up and you're ready to take the heat. Compatible with filter pump up to 1/2 hp or pump flow rate 2500 GPH.
eBay
Model Number: 520272 with 10k-ohm thermistor, 20-feet cable.
eBay
This product has a6 year warranty against manufacturer's defects. For start-up, open the valves gradually to increase flow and pressure in the unit. Then let cold water into the system, followed by hot water.
eBay