Final calculations, cold mains, 7.0C.
Definitely appears a (good) bit shy of full output, say 5/6kw, which may need verifying with gas meter monitoring, I wouldn't be too happy with the above to be honest as you might only effectively have a 24/25 kw shower.
You might also do the bath tap at its full output of ~ 14LPM.
Re Shower: IF the boiler output was/is 30kw then you will get 10.0 LPM at 50C. (from cold at 7C)
If the boiler output is indeed say 25kw then you will get 8.3LPM
or at a showering temp of 40C, the numbers are 13.03LPM & 10.9LPM.
Suggest you measure the flow and temperature from the shower as well.
| | DHW | Boiler | | | |
| Mains | Setpoint | Rated | | | |
| Temp | Temp | Output | | | |
| DegC | DegC | KW | | | |
| 7 | 60 | 30 | | | |
| Downstairs | | | | | |
| Bathroom | Measured | Achievable | Required | Actual | |
| Tap | Temp | Temp | Output | Output | |
Bath sink | LPM | DegC | DegC | KW | KW | |
7.12 - 52.4c | 8.4 | 52.4 | 58.0 | 30.0 | 23.8 | |
6.98 - 54.7c | 8.6 | 54.7 | 57.0 | 30.0 | 25.6 | |
| 8.5 | 53.6 | 57.5 | 30.0 | 24.7 | Average |
| Ensuite | | | | | |
| Sink | Measured | Achievable | Required | Actual | |
| Tap | Temp | Temp | Output | Output | |
Ensuite | LPM | DegC | DegC | KW | KW | |
8.39 - 56.4c | 7.2 | 56.4 | 60.0 | 26.4 | 22.2 | |
9.10 - 53c | 6.6 | 53.0 | 60.0 | 24.4 | 18.9 | |
| 6.9 | 54.7 | 60.0 | 25.4 | 20.5 | Average |
| | Measured | Achievable | Required | Actual | |
| Kitchen | Temp | Temp | Output | Output | |
kitchen | LPM | DegC | DegC | KW | KW | |
10.90 - 57.5c | 5.5 | 57.3 | 60 | 18.4 | 17.4 | |
10.77 - 57c | 5.6 | 57 | 60 | 18.7 | 17.5 | |
| 5.5 | 57.2 | 60.0 | 18.5 | 17.4 | Average |
| Bath | Measured | Achievable | Required | Actual | |
| Tap | Temp | Temp | Output | Output | |
Bath tap | LPM | DegC | DegC | KW | KW | |
6.11 - 53.7c | 9.82 | 53.7 | 50.8 | 30.0 | 28.6 | |
7.67 - 48.4c | 7.82 | 48.4 | 62.0 | 30.0 | 19.9 | |
| 8.82 | 51.05 | 55.7 | 30.0 | 24.2 | Average |