We have a Beta 60, 2014 vintage, which has run well
In 2019 we replaced the Beta UK supplied plastic header tank with a metal one from Beta NC. (incidentally, much better made, and with a proper safety overflow)
The original Beta coolant cap on the engine is rated at 13 psi, and (i just noticed) the Beta NC header tank cap 14 psi
All ran well until Spring 2020, when we ran the engine flat out (rare for us) and it got hot (not to alarm) and the engine cap leaked slightly. When we opened the heat exchanger for annual check/clean, we found junk of unknown origin half plugging the input end.
I just replaced the 14 psi cap (rubber deteriorated due to 18 month Covid enforced storage in Guatemala) with 13 psi cap
What rating cap should we put on the engine to replace the original 13 psi one?