Looking on the danfoss website it seems they make 2 automatic boiler protection valves. The VTC and the TV. They both appear to do the same thing so which one is the proper one to get for a conventional wood boiler with storage? Also is it better to install it on the supply or return? What are the best temperature choices for each previously mentioned applications? I also see most everyone on here runs a ball valve instead of a balance valve with these things. Do you need a thermometer just past the protection valve to get the ball valve set right or is there another way to fine tune that setting?