Two questions. The design guide that was supplied with the our heat pump (previous owner installed) has a few values that I want to confirm. What is that viscosity value of a 20% by volume of methanol? The design guide I have says 3.5 centipoises (cP) at 25 degree F. I ask because they have the wrong value for polypropylene glycol. I have given up searching online, as I have only found values for 100% methanol. When calculating the feet/head loss, the design guide I have says to use a multiplier of 1.25 for 20% methanol @ 25 degree F. My question here is whether that 1.25 multiplier is specific to my heat pump? ... because I found at http://www.waterfurnace.com/literature/envision/IM1006WN.pdf page 33 shows a value of 1.197 at 30 degree F, but there is no mention of which heat pump model those values apply to, as though the values are universal.