rayjackson1950 Posted September 30, 2022 Share Posted September 30, 2022 I have read at various times about drilling a hole in the thermostat to aid filling.My only question is what size? I assume no more than 2mm, but would like advise.This would certainly help me as my cross-flow only takes about 4.5litres on initial fill and many top ups therefter to get to the stated capacity. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted September 30, 2022 Member Share Posted September 30, 2022 Typically 2 mm.Here's a 3 mm hole in a K thermostat (thanks, Ian):Jonathan Link to comment Share on other sites More sharing options...
rayjackson1950 Posted October 9, 2022 Author Share Posted October 9, 2022 Thanks Jonathan. No picture though, but I assume just drill through the part that moves, when it opens/closes part of the stat. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted October 9, 2022 Member Share Posted October 9, 2022 This is the photo that I thought that I'd posted. From this thread, but NB it's a K.Thanks again, Ian.Jonathan Link to comment Share on other sites More sharing options...
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