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When connecting a heater, the water supply must come from below the thermostat. The heater will not work properly if the water flow is controlled by the thermostat.

TO CONNECT A HEATER:
 

• Remove the temperature sending unit from the intake manifold, install a tee in it's place. (B)
• Place the temperature sending unit in the side of the tee, the hose adapter goes in the top.
• Remove the plug from the side of the circulating pump (A). Install the hose adapter.
• Connect the hose adapter on the tee to the bottom fitting on the heater (C). Connect the hose adapter on the circulating pump (A) to the upper fitting on the heater (D). This will allow the water to circulate in the proper direction, as well as eliminate air pockets.
• If you have a 4 cylinder or a straight 6 cylinder, connect the water going to the bottom of the heater to the lower thermostat housing. The lower housing will have 2 or 3 water ports.

Use the same hook up for hot water tanks. Most hot water tanks have the water connections side by side, it will not make any difference how they are connected.