Houses with high thermal mass and low insulation do well in climates like yours. The warm sunny days heat the mass. On the cool nights, the mass releases it's energy and keeps the interior warm. The … ((more))
Boiler and distribution piping in the 2-4 fps range is a good idea. It requires less head energy and the pipes last a good long time.
As eluded above, don't try to get pex radiant loops in that range… ((more))
The IR gun will not work very well on the brass,copper and pex surfaces. If you wrap the pipe in electric tape you will get more accurate temp reading.
If it turns out that you have a delta of 40 on… ((more))
A quick look at the boiler manual and a couple questions
Are all 4 stages firing? If you have an amp clamp, you an check easily.
Are you running 240 volt single phase or 208 volt 3 phase to the panel… ((more))