Hi Steve,

horse menure is a notoriously good heat source and you seem to have plenty of it around. It's being used in greenhouses a lot. The mass itself can reach temperatures of over 60 degrees Celsius. When shoveled under about a foot and a half of soil, it will heat the top soil to about 20 degrees Celsius and thus it can keep plants growing under glass in winter conditions. Maybe you can set something up running a bunch of pipes through the menure depot and use it to warm up the water for the CV ?

HTH

Jurriaan