What type insulation to use on hot water pipes?

What type of of pipe insulation other than fiberglass will be suitable for use on a hot water loop between my stove and boiler. I know they make a high temp foam insulation that I can oder but it is very expensive and there is a minimum order of $100. Any how can the foam pipe insulation found at the big box store like lowes handle the temps this pipe will produce. I am sure it could hit 225* with out to much trouble being it going to a steam boiler.

You need an insulation designed for high temperatures. Ideally closed cell. HT/Armaflex is one. Good to 300 deg F. Unfortunately like most good products it's expensive. Check out:
http://www.armacell.com/www/armacell/ar ... enDocument

Too bad asbestos causes cancer, that was a cheap and easy solution for years.

Not only cheap and easy, there is no better product for the job either.

Just paint the pipe with several coats of high tech paint. As first identified by Matthaus see: http://www.nansulate.com/thermal_insulation_data.htm

Thermal conductivity is 0.017 W/mK, better than fiberglass. Made with nano spheres. $70 a gallon.

Yanche wrote:Just paint the pipe with several coats of high tech paint. As first identified by Matthaus see: http://www.nansulate.com/thermal_insulation_data.htm

Thermal conductivity is 0.017 W/mK, better than fiberglass. Made with nano spheres. $70 a gallon.

Is this stuff for real? It almost sounds too good to be true! That would be ideal to paint all the exposed HVAC ducting in my basement to reduce the heat leakage into the basement area and get the heat upstairs where it belongs.

http://www.nansulate.com/nansulate_translucent_HH.htm this is the high heat stuff. $80/gallon.

Found some high density foam at a local hardware store. It has a continous heat rating of 225*. From what I seing so far that should be sufficient.

The Department of Energy says to use extreme care in insulating gas-fired heaters with blanket insulation and recommends the use of water heater insulation kits instead. The Consumer Services Administration cautions against putting blanket insulation on top of a gas-fired heater.