Is rubber pipe insulation safe near water heater?

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GL77

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My plumber installed Uponor pex pipes in my utility room. My incoming water, shutoff, tankless WH and sediment filter are in this room whose door opens to the outdoors. This is a small space, more of a closet, really. I've been told I need to insulate the pipes because every time I open the door the pipes are exposed to sunlight which is bad for the Uponor. My question is, how close can the tubular rubber pipe insulation be to the tankless water heater? There's an 18" metal flex pipe that comes out of the WH, can I go right up to this?
 

GL77

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You can cover the pipes right up to the tankless unit.
I ran into a small problem, the plumber installed some of the lines pretty tight to the wall. Am I going to put undue stress on them if I force pipe insulation behind them?
 
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