First things first. A long overdue, and hearty, thankyou to everyone here, for the wealth of information you share.
With your guidance, two years ago, I was able to narrow my choice of boiler, and more importantly; I was able to track down one of the better installers in my community.
I would very much like to achieve near constant circulation, all winter long, with minimal cycling.
To that end, this coming heating season, I would like to optimize the pump speeds for the three variable speed pumps in my system. Especially the internal pump in the prestige. The other two are circulating pumps, each on one of two loops. All three have been on middle setting since install. So my overarching question is largely theoretical. Should I consider changing the speeds at all? If so, How do I determine in which direction?
I will follow up to this original post with any information people would ask for. But the basics are as follows. Two story DC townhouse, with newly renovated basement unit. Cast Iron radiators throughout the main house. Three panel radiators plus towel warmer, all with TRV's, in the basement unit. Currently configured as two zones (main/basement). almost certainly want to reconfigure to one zone this year.
It has become clear that the basement zone is so small that near constant bouncing off of high limit is a problem.
I have used the new system for two heating seasons. The first season the basement was unoccupied and kept relatively cool. This past year we kept the basement heated to livable temperatures. I was able to experiment with water temps and ODR the first year, and came up with pretty decent results. Last year the results were not great.
I realize I probably could have ended up with the solo 60 and an indirect water heater. But, overall, I am quite happy with the current setup
That said, I am hopeful that controlling the entire house, as one zone, from first floor thermostat will alleviate much of the cycling, and that the extra load from keeping the basement warmer will actually extend run times.
I appreciate and look forward to any thoughts.