I'm looking for a bit of advice.
With my imminent move to AG/BIAB, I am weighing up the options with burners.
I could go electric. The extra cost doesn't really bother me too much. What does concern me a little is the ability to get a good rolling boil of 30 or so litres with a single immersion element.
Some suggest using two, which leads me to a second concern, which is that my house is old and even though it's been rewired I am still a bit wary, even the elements they were running off different circuits.
Or perhaps I'm just being paranoid.
(Then there's the fact that electricity and wort don't mix

The other two options are gas burners. Gas bottles is option 1, but I am thinking of going natural gas because there's an outlet next to the BBQ/brewing area. That will make it much more convenient (and cheaper) than bottles.
So, the questions:
1. For those of you who use electric immersion heaters, can you get a good rolling boil from only one element?
2. Am I worrying unnecessarily about burning the house down by using an electric immersion heater.
3. If anyone is running their burner off natural gas:
a) How do you find it?
b) What sort of burner do you have?
c) Do you have any tips?
Thanks in advance for the help.
Cheers,
Oliver