Best Water Heater Blankets? or make your own?

[Andrew S.]

I have a few properties with water heaters that are in relatively uninsulated spaces (utility rooms, garage, crawlspace, etc) and I want to insulate them with a "jacket".  What are the best (most cost effective) products people here have had success with?

[Stephen S.]

When you put your hand on the sides of the units - do they feel warm to the touch?  If not;  they are probably not losing enough heat to make insulating them worthwhile.

stephen
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Originally posted by @Andrew S.:

I have a few properties with water heaters that are in relatively uninsulated spaces (utility rooms, garage, crawlspace, etc) and I want to insulate them with a "jacket".  What are the best (most cost effective) products people here have had success with?