Immersion heater.

AnnaStezia

New copper cylinder fitted. 90 litres. 30" high. Heated by top entry dual immersion and or back boiler.

Immersion heater alone is not heating enough water for a proper bath !

The old 30" cylinder had a dual immersion with a reach of 27" and was better!

I know that the new immersion has a reach of 24". I suspect it is too short and not heating the full tank.

Any thoughts please?

65535

Would it be possible that the bath/sink are reversed ?
What is the thermostat stet to on top

65535

Would it be possible that the bath/sink are reversed ?
What is the thermostat set to on top

AnnaStezia

Good idea.

Checked meter for bath and then sink. Meter goes faster for bath on and slower for sink on.

Removed cap of immersion to put phase tester on each terminal by turns. I find that BOTH sink and bath terminals show live for each position of immersion main switch ! I expected only one of those terminals to be live at a time. Is this a fault ?

Checked immersion main switch terminals in case it was faulty. I disconnected the wires out to the immersion. Switched on bath then sink options. Only the correct terminal went live each time. So, main switch seems Ok.

Methinks my immersion might be a dud.

The stat is factory set at 60 C.

65535

To test the heating elements - disconnect all wires - turn off all electricity - etc.

Use the ohm meter part of your mulitmeter on the elements.
You should have a short to indicate that the element is intact.

Just an indicator to see if the elements are actually working correctly.


It may be that the sink & bath work together ? - I dont think so though.

A more experienced poster will no doubt come along soon and let us know

Par1

AnnaStezia wrote: »

Good idea.

Checked meter for bath and then sink. Meter goes faster for bath on and slower for sink on.

Removed cap of immersion to put phase tester on each terminal by turns. I find that BOTH sink and bath terminals show live for each position of immersion main switch ! I expected only one of those terminals to be live at a time. Is this a fault ?

Checked immersion main switch terminals in case it was faulty. I disconnected the wires out to the immersion. Switched on bath then sink options. Only the correct terminal went live each time. So, main switch seems Ok.

Methinks my immersion might be a dud.

The stat is factory set at 60 C.

A phase tester is useless in this situation, use a multimeter. You will get a reading between the both elements because they both share the neutral which is broken through the stat - hence the apparent voltage between bath and sink. This is done to use only one stat for both elements (one of very few places its permitted) if not two stats would be required - one per element. The thermostat could be the issue and may not be heating fully to the 60 C - try swapping out the stat to eliminate that of increase the existing and test

AnnaStezia

Sink+bath = 44.7 omhs.

Sink+neutral = 26.1 omhs.

Bath+neutral = 18.7 omhs.

I think that the reach on the bath element is too short and is the problem. Plumber put in a 24" element I think. Cylinder is about 30" tall. Anyhow the plumber will be back so we will see !

Par1

I think standard 23 and 27 inch elements are both 3kw from memory (I stand corrected on that) so regardless of lnght the element can only provide 3000watts. If the stat is functioning correctly then it should open at defined setting i.e 60 C approx regardless of lenght of element. It sounds like your not happy with the water temperature..which is set by the thermostat, can you recall if the old stat was at 60C or higher...they can be set higher if required but take obvious caution if kids use the hot water etc

AnnaStezia

The temperature seems alright. There is just not enough volume of it for a bath. Sink is Ok. This is why I suspect the reach of the element.

iriship

I have the same problem.

checked all electric's all ok and checked for leaks by stopping water coming into tank, all ok.

I was told by a plumber that it my be cracked worm and hot water leaking out into heating system.

if you have any update can you let me know thanks

Jimibo

Hi, did you manage to sort out what was wrong?