I would NOT use styrofoam type insulation directly on or next to the heater or HW tank. I would use insulation that is designed to use around heaters. High temp with aluminum backing and fire resistant. Styrofoam will melt at a lower temp and could put off toxic gases in the process.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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