so I recently upgraded from a 15-58 to a 26-99 for the house loop. While using the 15-58 on high setting, my Delta T when DHW and Furnace were calling for heat was 40-42F (20 for furnace and approximately 20-22 for DHW) which is WAY to high IMO. So I bumped up to 26-99 and installed a few days ago. With pump set on medium setting I am now at a 30-32F delta when DHW and furnace are both calling for heat at the same time (15 for furnace and 15-17 for DHW). Is this sufficient or should I bump that sucker up on High setting and get the delta down even lower? I don't want to move the water so fast that it cools the register temps either.....anyone got insight here??? my only concern with running a Delta on the higher end is that when the water temp at the boiler is down around 160-161 and getting ready to fire, if everything in the house calls for heat....I will see return temps around 130ish...which, IMO is way to low. I have a g200 and it has been recommended that I don't mess with the temp settings as it has a high limit shut off set at 190. I think the factory settings are 160-180, and probably for good reason. My old heatmor I ran at 175-190 and had it dialed in at a Delta of 23F when everything in the house was calling, I was running a B&G-36 on high setting. so, even when water temps were at 175, and everything at house was calling, I was only seeing the lowest return temps at around 150-152F.
I feel like im over analyzing, but after making another HUGE investment in a new set-up, I want to do everything I can to ensure a long boiler life.
any input would be appreciated.
Thanks!