Ideal Logic won't bring on HW if flow rate under 3 l/min your boiler may be similar.
As it uses a turbine spinning to bring it on.
Your old boiler Isar used a cold temperature thermistor that sensed the water entering the plate going cold and would come on at any flow rate.
Gotcha. Thank you.
What would you suggest I do now then?
I'm fairly confident British Gas didn't test flow rate upstairs (or down for that matter).
Would you regard just over 4l a minute through the shower, when running 'normally', as slow? What are the margins here?
My missus had a shower this morning and it ran hot then cold. It's not like hours between fluctuations. It's while you're in the bloody thing.
You shell out the money hoping for an end to the hassle, but I've been landed with more. My wife and daughters ranting and raving every morning (even more than normal!) about cold showers is more stress than having no heating!