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What is the best way to change an immersion heater on a hot water cylinder? |
They look slightly rusty and I have tried to crack them off with a immersion spanner but they are solid, any ideas please? make sure the tank is full of water then run around the nut with a hacksaw blade then get a spanner and crack the nut if it still will not open hammer the spanner There is no way you are going to remove an immersion heater either with the proper spanner or anything else, it just cannot be done. For some reason they get "welded" in, forget it. I always fit an external immersion heater when the original packs-in. They ar e called "WILLIS" and they connect from the bottom of the cylinder to either the top, or a point further up the venter to create thermo-syphoning. They are very popular in Northern Ireland because of their ease of fitting, but less common in GB You must be very careful that you dont split the tank during the repair. First switch off all power to the tank, drain the tank of water using a hose connected to the bottom tap. Buy a immersion heater cup spanner, they have more strength and grip to take off the cap. Remover internal thermostat, undo all wires. Attach spanner and turn anti-clockwise, sometimes a hammer to sharply tap the spanner will help. If this fails to move the cap, best then to call a plumber. He may use a blow torch to add heat to the cap to loosen it. Good luck and be careful. Fluff Try to "crack" the old heater with hot water in the tank. Never turn the spanner with the tank empty, or you might buckle it and have a flood. get a rust spray or wd 40 spray on and leave for about an hour then use the spaner it should work .. good luck Okay first shut off cold water to the tank,next isolate the Immersion from the electricity supply.next fit the Immersion Spanner and try and give the element a slight turn tighter then try moving the element backwards.If this fails to move the Immersion element then try using a 2inch stilson wrench on it but only aplly minimal pressure as this may cause the threads to crack.If they grack the element will not seal properly on insertion of the new element.Also check the condition of the tank and if there is any pitting of the copper cylinder about the tank (green coloured copper errosion),especially as this can be a sigh that a pinhole leak will result when the tank is re-pressurised after changing the element. those two problems can result in the whole tank needing replacing and that can cost several hundred Pounds or Euros to put right by a professional. drain the tank down then tighen it up first to break the seal then undo If you have a blow torch heat it up and then use your spanner. It may take a while but should work. If not try 3in1 or go to a plumbing merchant and get some oil for this. The blow torch is better but be careful not to crease the tank. get a plumber is best. The answer above is the best idea, just cut around the fibre washer seal, make sure you drain down first. Another idea is to get a hammer and tap around the immersion flange, dont smack it one just firm taps, you dont want to dammage the cylinder. If that does not work, a trick i have used as a last resort, though on newer cylinders with the foam lagging you cannot do this. Remove anything that is flamable, using a blow torch heat up the copper around the immersion flange, only for a while, it wont need blasting. The idea is to warm the flange to make it expand, turn off the blow torch and place someware that wont burn or melt, get your immersion spanner (A box spanner is best) try to turn it Depending on what your cylinder is made of copper or galvanised . if its the latter no problem you can heat it up first immersion spanner and hammer or large stillsons. WD40 will do the trick and a good tight spanner |
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