first of all, the stove must be mobile or modular home approved.
HCD is the place to get your building permit, not local county typically..
some requirements for mobiles:
1. stove must say its approved for mobile/ modular on its label.
1,a. stove must have outside air source
2. stove must use close clearance(double wall) interior pipe
3. stove must be bolted down so it cant fall over if you ever move(dumb code huh?)
4. stove must be grounded with #10 copper wire or equivilant
here is some info on choosing a new heater
http://woodheatstoves.com/choosing-y...r-p-12040.html
inserts into fireplace need to be zero clearance approved.
for any heater, follow installation instructions from maker