What type of insulation to use for boiler pipes

[Art]

Hi everyone. First wanted to thank everyone for all your help. I bought a house recently that uses a boiler to heat the house. I want to insulate the pipes but not sure what's the best route is. I know the fiberglass is probably the best but is it overkill for a boiler heater? For 10 bucks every three feet it is a bit pricey. Will something like this be just as good or do I have to worry about it melting.
https://www.homedepot.com/p/Everbilt-1-in-x-6-ft-Foam-Pipe-Insulation-ORP11812/204760805.

truly appreciate you guys taking the time to answer questions my most likely dumb questions

 

[Diehard]

If you really wanted to figure out the payback on insulation for you heating pipes it can be done.
You can start with the following calculator for estimating change in heat loss. The you can find cost to make up the difference.
https://www.wbdg.org/guides-specifi...s/temperature-drop-calculator-hydronic-piping