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Insulation technology has come a long way in recent years. I just finished up work on a Can-Am Commander 1000 X.
Installed a heater and insulated the interior panels around the engine and floor under the seats, both to reduce noise and to keep heat out of the interior in summer and hold heat in the interior in winter. (The rig has a Mammoth Skins rear panel and side curtains, BRP factory plastic roof and windshield option.)
I used two different materials. One is a non-woven fabric, about 1/4" thick with aluminized plastic on both sides, reinforced with a mesh, probably fiberglass. Supposed to withstand very high non-contact temperature. The other is Hushmat, a black, tarlike substance with heavy gauge aluminum foil on one side. Somewhat less expensive than DynaMat.
What might work well for insulating a hot coolant tank or PCM heat storage is cast in place foam. Smooth-On has silicone and urethane foams in a range of density and hardness. A low density, rigid foam would be what you'd want for stopping convection and radiation heat transfer.
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