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I'm assuming your saying you have hot water heat and you're having trouble with the broiler or stoppage in the pipes leading from the boiler to your wall radiators. Every household boiler I've seen has been very old and isn't worth replacing. If you decide to replace it, you will be replacing more than just the boiler. You'll be replacing many copper lines as well. The solution is usually changing to some alternative style heating such as electric baseboard with individual thermostats.
The problem is called water hammer it happens because water lines have become lose inside the walls. Generally because pipe straps have loosened or even broke, or not enough of them were used at time of installation letting pipes rattle against them selves or walls and so on.
It is referred to as "water hammer" It means that there is air trapped in the pipes and causes chattering (it will also rattle loose pipes in walls). Best option is to have a "pressure tank" installed at the water heater to reduce this. Hope this is helpful.
Insulation only slows down the transfer of heat (cold), it does not stop it. If it is below freezing and the water in any pipe is not moving, it will eventually freeze. Most major industrial supply houses like McMaster-Carr or Grainger in the US, carry pipe tracing tape. It comes in various lengths and you secure it to the pipe under the insulation, plug it in and many types have integral thermostats that keep the pipe above freezing. If you have a washing machine, you will have to consider the lines to the washer valves, both hot & cold and any other areas in the washer that may hold water like the pump and the discharge hoses.
Was this washer always outdoors?
Sounds like you are trying to hatch chickens. The heat tape is designed to keep pipes from freezing, and will not be warm enough for an incubator. Try a heating pad or electric blanket, or if you are really serious, you could just BUY an incubator
no the coating cannot be repaired, because the coating is heat resistant and anything u put on will not adhere or be heat resistant enough, a silicon auto sealant may last for while but not likely to last long, u cannot solder as to high a heat will ruin core, had a though there is a cold copper solder solvent for fusing copper pipes if u wrapped with this copper tubing and cold soldered it might work it works on hot water copper pipes. If u try this and it works please keep me posted on this my email is firstname.lastname@example.org