Do I need shower cartridge replacement?
Called a plumber today to look at our shower. Recently (last 2 months) the hot water has taken 5+ minutes to come on. When it does, comes only at the very highest temperature. The sink in the same bathroom gets hot water much faster; the bathtub in the adjacent shower/bath gets hot water right away. Plumber immediately said the shower cartridge needs to be replaced. He wasn't able to take care of it today, but said he could do it as a weekend job for $400. I've looked up shower cartridge replacement online and nothing anywhere says anything about water temp and shower cartridges. There is no leak. The knob seems to work as it always has. Would a cartridge replacement solve the hot water problem? Thanks.