I just had a new water heater installed at my townhouse.after the insall the installers told me to let the water run for a lttle while.and I did,I get hot water at all the sinks in the house and the faucet in the bath tub,but when I pull the diverter for the shower no hot water comes out.just luke warm.I was wondering if there is something I could do to fix this and why is it doing that?

I think you have dirt in your shower head, caused by w/h replacement. Remove shower head, clean filter, run water through shower w/o shower head installed. Reinstall Shower head. You should be back in business.

Thanks I will try that.