Jay and I did this install in one day.

As You can see in the first picture the Heat exchanger fit nicely into plenum of his hot air furnace. Or Hot Air Kit

In the second picture I'm hooking up the hot water heater. This is a Ten Plate water to water heat exchanger. Or see Domestic Hot Water kits.

Third picture you can see how we came through the wall. We measured wrong and need to fill one hole. Measure twice drill once!

Forth Picture shows completed water to water heat exchanger hooked up and running.

Fifth picture shows completed water to hot air furnace hook up.

Sixth is just another angel so you can see how easy it really is.