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Will connecting a 220v 3kw immersion heater to a 110v transformer damage any of them

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macworm | 21:23 Sun 13th Nov 2011 | Home & Garden
8 Answers
I want to reduce the power used by my immersion heater so that I can heat my hot water slowly using solar power without changing the immersion heater. I already have a 1kva 220v to 110v transformer. I think that connecting the immersion to it would mean that it would only draw about 750 watts

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You are right - one quarter of the power consumed by the 3kW immersion heater if it were connected to a 240V supply.
But is the transformer rated at >=750W?
21:29 Sun 13th Nov 2011
You are right - one quarter of the power consumed by the 3kW immersion heater if it were connected to a 240V supply.
But is the transformer rated at >=750W?
Question Author
Transformer is pretty old and label not clear - says 205-230v 50/60hz to 115v but rating not readable, believed to be >1000w
I think it may well fry the transformer.
This may interest you ...
http://www.pistonhead...&f=207&t=927161&mid=0
If you smell hot insulation when you switch on, then maybe it wasn't such a good idea ;-) But maybe worth a try.
Question Author
Some interesting stuff on 'petrolheads' link - EMMA unit at around £2k is quite expensive. Looks like lots of folks have similar thoughts on how to maximise returns from solar so it's likely something will turn up it time

Thanks for the feedback - any further thoughts more than welcome
Question Author
Oooops should have been 'pistonheads' !!!
What is the efficiency of the transformer though?
Question Author
Hi Billy, the transformer seems fairly efficient as never runs hot and certainly nowhere near the potential 2.25k saving obtained by feeding the heater at 750w - I'm no expert but if this is viable I could monitor it initially

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