I recently installed a Hayward HP21404T heat pump. Since then my pressure is running about 9psi higer (with a clean filter) than it did before. With a freshly cleaned filter, I use to run at 12psi. Now it is at 21psi. I always cleaned the filter if it got to 26. Allthough the heater has 2" inlet and outlet, I plumbed with 1-1/2" since that is what was existing. The installation added about seven 90 degree fittings and I used ball valves for a bypass from the local farm supply. I just realized that the ball valves are not full flow. Bypassing the heater is still 15psi having to go through one ball valves.

I have almost everything I need to change to 2" plumbing from the filter to the return including pharer 2" full flow valves. The return actually has 2" fittings plumbed like a manifold that is fed with 1-1/2" and breaks back out to 1-1/2 inch to two seperate return lines.

Do you think I will drop the pressure any re-plumbing or is higher pressure common from a heater?

Thanks!