Exactly the same way you do in a regular house.
The biggest difference you will find between mobile home water heaters and house water heaters is the the mobile home version is generally slimmer in order to fit in the smaller spaces in a mobile home. The installation is also different as the mobile home heater feeds from the bottom and vents from the bottom.
If your modular home has a regular gas supply that is a satisfactory way to do it.
Not much actually,a Mobile Home water Heater has the water connections going into the side where as a Regular Water Heater has the connections at the top. So if you have enough room above a mobile home water heater you can install a regular water heater no problem.However a lot of mobile homes do not have room above the water heater so your forced to use a Mobile Home water heater instead. Which usually costs about a hundred more than a regular one.
Yes, they are the same unit.
Yes, you can. That is the common fit.
Yes, they are exactly the same.
According to DIY websites there are basically no dfference between the units except some is labeled mobile home water heater and others are not. Also some may have water inlets on the top and some on the side.
Regular insurance will not. If you just purchased the house and have warranty insurance and the water heater is listed it will.
YES, of course. All home water heaters, furnaces, air conditioners etc are the same as in a small regular house.
Gas mobile home water heaters have a valve to allow the use of natural gas or propane.Ans2 - I have seen and repaired many. Most, whether electric or gas are the same as in an ordinary house.
Check with your manufacturer. My (ancient) mobile home has a small metal placard affixed on the outside that says "water intake", which is where it is located (under the home). Newer models have a valve inside the home, but the location varies. Check near the shut off valve for the hot water heater.
All the mobile home water heaters that I've seen are the same as regular house water heaters, -if you can change install one in your house, then you can install one in a Mobile. The actual procedure differs if it's electric or gas and as you don't say which, that's as far as I'll go for now..