Just discovered, quite by accident, there has been a recall notice on Rheem Heat Pump HWS and thought maybe other people might not know about this either. Mine is all over the place in regards to water temperature and running times, and costing an arm and a leg to run when their advertising promotes it as 'energy efficient'. After talking to a Rheem rep at a recent Home Show he invited me to phone the office and request a free service call. Well that 'free' service call will cost $150 unless the HWS is under the recall notice....so I asked which models are covered by the recall and sure enough mine is, so fingers crossed this is just one of the reasons it's not a happy HWS.
Because I'm not familiar with the models covered by this recall, go to their website and check if it applies to yours....first check the model number and date of manufacture on the HWS to make it easier. <www.rheem.com.au>
Hope this helps?