As above ^^^^ the bottle heaters are very safe. They are not cheap, and the shut off before they over pressurize anything...Also here is a list of facts most do not know
1. Nitrous is best used at 950 PSI
2. The bottle is rated at 1800 PSI
3. The blow off valve on the bottle is rated at 3,000 PSI
4. The bottle burst strength is 3600 PSI.
So as you see at 950 PSI we are operating in the safe limits of what we are using, still at 950 PSI it should be respected , but it is SAFE... Oh yeah, one more fact.. nitrous is an oxidizer , but it is NON-FLAMABLE
Speed is only a matter of money; how fast do you want to go?