I recently bought a house with baseboard heating. This is my first house with such a heating system and I've gone about trying to see how it is laid out but it is challenging given I don't want to tear out any walls.
There is a gas-fired boiler in the basement. There are three heating loops (zones). Each loop has a shut-off valve on both the supply and return side. They are not automatic valves, they are manual ball valves. From what I've worked out, Zone 1 has 30 linear feet of radiator (baseboard), Zone 2 has 23 feet, and Zone 3 has 35 feet. I'd like to confirm this though.
What I was thinking is I could isolate two of the three loops, turn on the heat, and just go near each one and feel for warmth. This would confirm which baseboards are on which loop.
I assume I need to close the shut-off valve on both the supply and return side to completely isolate the other loops. Are there any other precautions or steps I should take beforehand or be aware of?