I am planing on installing my new woodgun 180 and the manual says returning water cannot be under 160F. After reading through several old posts I came to the conclusion that a Danfoss Thermic By-pass Valve would be suitable. My local wholesaler gave me a spec sheet and it lists the 160F units as supply side and the 140F and 113F are for the return side. Can I just install what they call a supply side 160F unit and put it on my return side? Also my current piping has nothing larger than 1" but the new woodgun has 1.5" fittings, should I get a 1.25" or just a 1" valve. They are around $300.00 does that seem reasonable?