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some coil/furnace combinations are supposed to be installed with a spacer between the furnace and coil, especially oil furnaces, check the instructions.

The dampers that are built in to the baseboard covers can be used to balance the different rooms, open up the coldest room fully, close off most of the warmest room.

This type of system is supposed to be designed with a room by room heat loss calculation then the baseboard in the first room is sized to the get the needed heat output using the water temp from the boiler, the next room is sized to get the needed heat output using the water temp coming out of the emitter in the first room, the emitter in the 3rd room is sized using the water temp coming out of the second room. The sizing is done by putting part fin tube and part plain pipe inside the baseboard radiator covers.

I always wear a personal CO alarm. I get teased about that, but you know the best part about getting teased? You have to be alive for teasing to matter. A nice, quick overview from Ray. As a retired paramedic who has taken the NCI course more times than I can remember allow me to interject this about symptoms: They are wholly unreliable prognosticators and virtually never manifest until you have been significantly exposed. The exception is chronic low level CO. While CO itself is not cumulative in the body but clears at a half life of 3-5 hrs. depending upon your sources, the sequelae, meaning the long term effects from cellular hypoxia can be. There is a growing body of evidence for chronic low level CO sufferers becoming so debilitated they become non-ambulatory but bedridden. How many people take drugs for mood swings, ADHD, psychosis, etc. when it is really CO? How about those mysterious allergies that fail to show up on testing? Chronic headaches diagnosed as idiopathic (meaning they don't have a clue). How about your mental focus, memory, reaction times, and cognition? Think of CO poisoning as suffocating because that's the net effect to the cells- hypoxia. You need O2 for Krebs Cycle (Citric acid cycle) for cellular aerobic (oxygen) metabolism. Another side effect of CO is the garbage piling up at the curb. Hemoglobin cannot assist your blood plasma with removing the metabolic wastes from cellular metabolism, such as lactic and pyruvic acid. Thus, these metabolic acids damage cells as well as cause metabolic acidosis to some degree.

In this weeks video, I talk about the dangers and effects of carbon monoxide exposure.

The biggest question is why? What's stopping you from using 1/2" that's available everywhere?

depends on the loop length.

The PPI online calculator is good to run examples

https://plasticpipecalculator.com/PressureDropHeadLoss.aspx

100’ of 3/8 pex at 1 gpm

14, head will take a high head circ

80 years old? Probably closer to 100 or more. It may be the original boiler in that house.

unless the connector or hx is leaking in to the cabinet and being pulled in that way