During the cold snap earlier this year the external waste water pipe from my combi boiler froze causing the boiler to stop working. The solution was fairly simple. I used a hair dryer to gently thaw it out and then covered it with an adapted piece of hot water tank lagging. This worked fine and I had no further problems during the winter. However the solution is a bit unsightly and I was wondering if anyone could recommend another type of lagging intended for extrior use (preferably white).