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It really depends on the type of boilers.
High pressure boilers can have a lot of energy, but the older ones used in houses should be low pressure.
They can be dangerous if not checked and serviced correctly.
I know Mythbusters did an episode on one exploding, it leveled the house.
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i believe they are generally serviced annually in the UK and for sure if you are a landlord, by law you have to have the boiler serviced annually as part of a gas safety check
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boilers are pretty well cared for, only licensed techs can do anything to them and there are plenty of inspectors etc
although i would also like to hear some boiler horror stories and maintenance tips if you have them (in my house we only have water boilers, not gas), but I'm in Bulgaria