You might want to take up the "should be safe" issue with your insurance
provider.

I suppose someone could find a new water heater, but using the new water
heater for a compressed air pressure vessel would be a bit far fetched, IMO.

Did you notice SM's omission of the critical safety devices in his post?

A bit of skill.. pump.. water heater tank = potential disaster.

--
WB
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wrote in message
...
And what pressure is a new water heater tank tested to????? The
overpressure valve is generally rated at 150PSI and 210F - I've seen
the pressure rating higher - so the tank has to be good for at least
150 psi (new).

If the compressor is limited to 120PSI, a sound water heater tank
should be safe, but a propane tank is better, and timed out propane
tanks are readilly available and cheap.