Re: immersion heater advice
- -----Original Message-----
From: ken hawkyard-gibson <oobruckner@...>
To: Distillers@onelist.com <Distillers@onelist.com>
Date: Saturday, February 05, 2000 8:07 AM
Subject: [Distillers] immersion heater advice
From: =?iso-8859-1?q?ken=20hawkyard-gibson?= <oobruckner@...>
Hi all, I am just completing a stainless steel still
based on the one in Ola Normans book
(www.partyman.se). My boiler is of 28Ltrs capacity, I
have installed a 21/4 BSP flange into it, this will
take a 11inch immersion heater. The problem is the
only immersion heater I can get off the shelf in the
UK is rated at 3Kw 240V and will be far too powerful.
Has anyone any ideas?
First of all some data to bear in mind:
Resistance of your 3000w element is 19.2 ohm (at heat)
Mean current is 12.5 amp
Peak current is 17.7 amp
Now get yourself a power diode rated at 600v and 60 amp (or thereabouts -
look in your Maplin catalogue. Use two or more in parallel if you cant get
that current rating, bearing in mind the peak current it has to handle,
allowing a comfortable margin of at least x3 max current and at least x2
Shove it on a good heat sink and wire it in series with a 10 amp fuse (your
UK plug will do)and the element.
Wire in a switch across the diode - when closed you will get 3000w, and when
open you will get 1500w
To take it further, you might consider load shedding by inserting a matrix
of ceramic resistors in series with the element. That way you make toast at
the same time!
Finally - having said all that, the average Brit kettle uses a either a 1.5
or 2kW element. You can't get one???
All the best,