Have you used this member before? Elec boiler output is in kilowatts--- kw = btu/hr---thus a kw elec boiler = , btu/hr oil-fired boiler---a kw elec boiler = , btu/hr oil-fired boiler. Blockages can also cause serious damage if you don’t fix them quickly the cost of damage from leaking water and blocked pipes can far exceed the cost of professional.
If you have a blocked or stubborn drain, the first thing you want to do is reduce or eliminate the water you put in the lines to minimize the amount of damage you may do obviously, if you keep flushing a slow-moving toilet it will overflow the bowl and damage your floor. The following information is helpful for emergency assistance. Thankfully, virtually all modern kettles switch themselves off.