On Friday, 9 September 2016 13:56:37 UTC+1, dennis@home wrote:
On 09/09/2016 08:35, Andrew Mawson wrote:
"dennis@home" wrote in message

However why not use an immersion heater and run it at reduced power.
They are about the correct length and more robust.

Because:

a/ they are metallic so would contaminate the plating

plate it first?


b/ too high power - these are 100's watts not kW

240V 3kW immersion on a 24V supply is about 30W if my mental arithmetic
is correct. Just use a dimmer (a big dimmer?) its a resistive load so it
doesn't need any fancy electronics.

a lighting dimmer on minimum would give around 1.5kW on a 3kW element. Perhaps you'd recommend tossing in the potatoes first.

Feeding mains to a nonwaterproofed element in water is not a sane idea. If you do install it waterproofed, DHW elements routinely split open near end of life & pass mains through the water.

Oh... and some are copper alloy plated, which is lethal to fish. Other than those points a great idea! Dennis strikes again.


NT