The problem with the stove is its intended location. It will be mounted higher than the hot water tank. That leaves out heat by convection. Running a pump won't work, because of the drain on the solar system. Lying in bed one night, an idea came to me; why not have the water circulate itself by building a giant percolator!

By taking advantage of water's ability to expand and contract, as it changes its state from a liquid to a vapor, it can pump itself up or down hill.

Here's how it works; water is heated inside the stove's water heating coil. When the water starts to expand and turn into steam, it pushes itself and any water in front of it out. It can only go in one direction because an inlet check valve resists backward flow. As the steam that was just pushed out of the heater starts to cool, it contracts while turning back into water again. As it shrinks, it can't draw from the outlet because of a check valve installed there. The only thing that can happen is for it to draw more water in from the inlet side to start the whole process over again. I ran some tests and found that the diameter and the angle of the tubing affected the efficiency of the system beyond my comprehension, but after a little tweaking, I got everything working fine.

Update: since the advent of efficient magnetic rotor pumps, this steam propelled system is no longer needed. These new pumps will simplify the plumbing and consume only 1/4 amp of electricity.