175,000 BTU/hr: 30-Plate Heat Exchanger, 3/4 MNPT ports, 3" x 8" Available both with 3/4" Male or 3/4" Female NPT connections (specify during checkout) Popular for Solar Heating applications SVO / WVO oil preheating for cars / trucks / boats Beer & Wort Chilling For help with sizing visit: http://www.brazetek.com