What is the exact correct voltage supplied by the transformer?

After reading tons of Q&A-s and FAQ-s, forum discussions and supplier sites - I am still unable to find a definite answer about the correct voltage. 12V and 18V are mentioned, but also on some sites 14V or 15V - and nobody (?) is certain. Not even the expert(s) from this site, or those from Aqualisa (the Gainsborough Diplomat is built with their components, isn't it?)



The manufacturer is so paranoid about their 'trade secrets' that they have NEVER documented this voltage in any of the publicly available guides, specification lists or other documents. Not even on the sticker on the transformer itself, where they only show input but not (!?) output voltage.



The reason why one ABSOLUTELY NEEDS this info (ideally with a 'from-to' tolerance range) is in order to assess whether they need to buy a replacement transformer:



In many cases there is SOME voltage, but the customer has no wat of knowing whether it's the correct one. In the above question someone had measured 3.1V - it doesn't sound right, but your answer is far from convincing, not what a confident expert should state.



I am measuring consistently 60V ac on the white output cable that goes into the shower. Pretty sure this is not exactly 'low' voltage and perhaps not entirely safe (or regulations compliant). The puzzle is that the pump motor (and the rectifier I presume sits on the circuit before it) has been working for several years and never got burned or even overheated from this (supposedly triple or quadruple) voltage.



What is the EXACT, CORRECT output voltage of the transformer? Within what tolerance range is it acceptable as 'normal'?



What does 60 Volts mean about a transformer? Is it a voltage the shower can operate with?



(My meter is accurate an calibrated and I am reasonably literate in electricity matters)



Thanks & Best regards