I installed a heat exchanger for a swimming pool to heat my shop loop. The problem I have is the exchanger is getting 180 degree water ,but it will not put out any water hotter than 80 degrees on the other side (shop loop). It has 1-1/4" ports incoming and 3/4" outgoing to shop. My alpha pump shows that 3 gpms are flowing through the 1-1/4" underground thermopex and to the radiant manifold. Is the pool exchanger the problem or something else?