ideal Solar In port!

The Solar Out port is best configured as part of the built-in boiler drain setup. Take out the original drain and replace it with a ¾" by 3" brass nipple, leading to a ¾" x ¾" x ¾" brass tee. One branch of the tee goes to a ¾" brass boiler drain, the other goes to the heat exchanger. This configuration is shown in the diagram on the right.

Double-pumping

If your system uses a second pump, install it before mounting the heat exchanger. Make sure it's a small pump (to maintain stratification) and put it on the Solar Out line, as shown in the diagram (above right).

Fiberglass tanks

A special note if you're using a plastic-cased fiberglass tank: remember the implosion problems caused by low internal pressure. You will have to give up one of your top ports to install a vacuum breaker, moving the cold inlet to a brass tee connection near the bottom of the heat exchanger, as shown in the final diagram on this page.