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I had a Greenstar 30si (same as Junior with HW temp control) which worked perfectly on heating but terrible hot water until I changed the pump! That was more of a "hot, cold, hot, cold" situation than permanently low temperature though.
What flow rate do you have? Time how long it takes to fill a 1 litre jug from the hot water tap, repeat the process a few times and take an average. Then post your result.
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