Would suggest the delivery delay from hot water tank yo the shower could be overcome by fitting a recirculating device – contact this person for details and pricing : Steve Rork
President
Laing Thermotech, Inc.
2295 Main Street
San Diego, CA 92154
Phone: (619) 575-7466
Fax: (619) 575-2739
Mobile: (858) 735-5196
Email: [email protected]
Web: http://www.lainginc.com
Web: http://www.autocirc.com
Regarding the issue of poor pressure – if the hot water heater is in the attic is it feed directly from the cold water supply from the street or via some kind of pressure reducing device/valve or a supply tank? If it is the later then the pressure is related directly to the “head” of water above the outlet. If the water heater is feed from the street supply directly then it sounds like either the shower rose is blocked with some foreign materials or the inlet/outlet water pipes at the water heater are restricted somewhat.
Have a Plumber check them out for you and while he is there ask for a quote to install the above recirculator device.
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians