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The previous owner has set up this way for some reason. I suspect because of the underfloor heating in the open plan kitchen, which uses the boiler rather than electricity. There are 2 pumps, one to the radiators, hot rails and hot water cylinder etc and the other to the underfloor heating...

Just to clear up, the engineer did come back to me and confirm he missed a decimal point. The gas rate was 3.7m3h

Thanks. I did not get the chance to check the reading when he was doing the work. But you are right, the pressure comparison were 1) at the meter and then 2) at the input to the boiler. At boiler, the 9.5mbar is very low vs manufacture recommended pressure ~17mbar (Vaillant EcoTec plus 637)...

Thank you for the responses. I’m not sure what test he ran to be honest, though I understand he tested on max rate (full load). Suppose I’ll have to measure the pipe on the right of the meter in picture (one that goes to my house)? We have only 7 radiators, 2 hot rails in the bathrooms and 1...

First of all, Im on a learning curve with this topic so any help/ guidance would be greatly appreciated. Thank you! Long story short, boiler broken, PCB and gas valve replaced (was told that one might have short circuited the other). All working afterwards and engineer also did a service...