In winter 2003 I "updated" my heating from the 70th by adding a self-mede Heating control.
Now I calculated the saved heating-costs:
I needed in the years:
2001 : 19.559kWh
2002 : 20.614KWh
(installation of the control)
2003 : 12.345KWh
2004 : 11.236kWh
That means that I save 40% of heating costs!
(more than 600,-EUR in the last 2 years)
And the costs of the control-unit was only 40,-EUR
Controls temperature of the sand , air and the lights
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Gas volume counter
I connected a CNY70 (optical reflex sensor) to my GAS-Meter. Now I can measure the needed volumes. For statistics I save also the outside-Temperatures.