The shell-and-tube heat exchanger is based on the 60°C (140°F) temperature difference between the inlet and hot water, and can provide a fresh pond of 200 kBtu/hr. It gets hot immediately without waiting.1 1/2 FPT FAST 304 Stainless Steel Pool Heat Exchanger Tube 200K Same Side. This kind of heat exchanger is a very safe, reliable, efficient and cost-effective way to heat swimming pools or spas through any hydraulic system. The heat recovery pool heater is very suitable for swimming pools, spas, hot tubs, solar, hydraulic heating, oil cooling, heat recovery, snow melting, etc. 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. Product Size: 48.514cm/19.095.5inch. 1 x stainless steel heat exchanger. Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it's non-workdays, please kindly be patient and wait till Monday.