I have hot water in taps but shower doesnt get very hot. Water temperature is on max

Hi Lucy This sounds to me that who ever fitted the shower didn't fit non return valves on the hot and cold pipes feeding the shower and with the high pressure of the cold water this will slow the rate of hot water coming into the mixer. Or the cold water will need balancing with the hot this can be done using a isolation valve on the cold pipe feeding the shower but by doing this you will loose pressure on the shower. steve from Aquafuse Plumbing and Electrics

Hi Lucy, Your heating may well be working fine, but if you have a domestic hot water heat exchanger that is full of scale your hot water won't be very hot and you may also have poor hot water flow rates. If you have good flow rate and reasonably hot, hot water at all other outlets it is more likely to be and issue with the shower unit itself, potentially scale again. Hope this helps. Regards WILLIAM PICKERING WJP APPROVED PLUMBING & HEATING