That not correct in the case of the shower, assuming you are running with a shower temperature of 40C (are you?) and because the boiler HW temperature is set to 60C and presumably delivering it to the shower at this temperature then to get 8.5LPM from the shower the shower TMV MUST mix 4.4LPM @ 60C from the combi with 4.1LPM @18.5C from the mains to give 8.5LPM @40C. So the boiler is only providing 4.4LPM for whatever reason, could be shower TMV or shower filter restrictions, thats why I asked you to do the test "switch off the boiler, turn the shower TMV to full hot and measure the flowrate", then all the flow will/should come only from the boiler.
Suggestions for boosting shower flow rate (combi / cylinder / both)?
- Thread starter myxiplx
- Start date
That not correct in the case of the shower, assuming you are running with a shower temperature of 40C (are you?) and because the boiler HW temperature is set to 60C and presumably delivering it to the shower at this temperature then to get 8.5LPM from the shower the shower TMV MUST mix 4.4LPM @ 60C from the combi with 4.1LPM @18.5C from the mains to give 8.5LPM @40C. So the boiler is only providing 4.4LPM for whatever reason, could be shower TMV or shower filter restrictions, thats why I asked you to do the test "switch off the boiler, turn the shower TMV to full hot and measure the flowrate", then all the flow will/should come only from the boiler.
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