Recent content by mcpunto

The CH pressure is at 0.8Bar or 12 psi and drops about 1psi when the DHW is being used. Haven't seen it higher than 1 bar when not in use and at 1.2 Bar when running. The noise I think is from air or gas and varies according to the amount of heat it is generating even with a constant...

Thanks Dan, Bath taps 1/4 turn style. Have just fiddled with the temp when running the tap in the sink. It normally doesn't make the noise even when turned full on. If i turn the thermostat temp up then the noise will start for the sink as well even with the tap only half on. Can hear...

Hello, I have inherited an Isar HE35 that has been working well but is now starting to whistle when working hard. The whistle sound is generally only heard when filling the bath with the bath tap fully open. Opening the cold tap can reduce the noise. The sound gets louder as the system works...