Can this tape be used on a water heater flue/vent?

I used it on my gas dryer vent and it has held perfectly for three months now. I believe my use is very similar to what you want to use it for.

what kind of tape can use to put together the double bubble insulation

You can use this aluminium tape it works great. I used it to insulate bubble insulation

Can this tape be used on the heat exhaust pipe for a gas hot water heater?

I believe so. I used it the exhaust for my gas clothes dryer. This is very similar to the pipe you are asking about. I used the tape almost three months ago and so far it has held perfectly. Great product.

Is it safe to use as a high temp tape for wrapping the heatit heat cable?

Normally we wrap HEATIT aluminum foil tape around the pipe for a better heat transfer. As we know the aluminum tape is conductive. I think you can use the Heatit aluminum foil tape as high temp tape for wrapping HEATIT JHSD, JHSF, JHSF1, JHSF1-CT. For these cables they owned the out jacket as the insulation.

Brand	HEATIT
Color	2.4mil
Material	Acrylic, Aluminum, Copper
Number of Items	1
Special Feature	Heavy Duty
Product Dimensions	2"L x 2"W
Surface Recommendation	Metal
Water Resistance Level	Waterproof
Size	10-yard
Item Thickness	2.4 Mils
Upper Temperature Rating	248 Degrees Fahrenheit
Compatible Material	Acrylic, Aluminum, Metal, Paper
Unit Count	30.0 Feet
Manufacturer	Zhukeshi
Item Weight	3.84 ounces
Item model number	6947881563573
Is Discontinued By Manufacturer	No
Material Type	Acrylic, Aluminum, Copper
Manufacturer Part Number	6947881563573-P

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