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Boiler is a Vokera Synergy 28e I can see what you mean - but when there is a draw on the thermal store ( ie the heat exchanger is in operation), the temperature of the water in the store will of course drop as it gives up it's heat and therefore the return temperature from the internal...

just my pennyworth- have just completed DIY install of new CH and water supply in major extension. Fitted a 250L heat bank from DPS ( heatweb.com). We are (I believe) lucky in having about 4 bar water pressure- but extremely pleased with set up, with very good flow rate through showers- so much...