It's an amazing job. It looks like a magnified cpu's cooling block. I had thought to add something like heat - exchanger to the boiler. But for me it is difficult to get the preheat chamber like yours. So I rotate the copper pipe around the boiler which length is about 1.8 meters. As is known the bo...

I recommend u do the job . I have my classic improved with adding pid controller , plc time relay， preheat copper pipe ,pressure gauge and etc . Upon that I got adjustable brew pressure which was set at 8.5 bar, much more precise temperature control and adjustable pre-fusion time. I needn't calculat...