Now, now chaps, lets not get excited about a simple pump. Alan asked politely if it was possible to control a central heating pump electrically and I guess that this is not possible but seeing that these pumps are used in central heating systems where they are expected to run for many hours, sometime days without stopping and give years of service, they are a cheap alternative to the rather expensive suds systems available commercially. My system cost about £25 but could have been made cheaper had I not bought a valve and clicklok pipe but used a gas valve and copper tube instead.
Now before anyone gets technical and starts quoting figures and procedures, in another life I worked in an oil refinery for 30 years and for a good part of that time was responsible for all oil movements and storage. Operation of pumps was second nature to me, from the very small to the truly enormous. You dont play about with oil without following very strict operating procedure but then that was then, now we are talking about a hobby, a pastime where we relax and get pleasure from our efforts successes or failures. When someone new to the hobby asks a question, surely the attitude shuold be to help and not criticize just to score points
Ray Lyons