I'm having a new bathroom installed. I hired a plumber to do all the water works. He ran all the lines; he is now waiting on sink and toilet to arrive to finish installation. Since he ran new line, we have noticed that the temperature of the water in our current shower fluctuates randomly. We've noticed the same with the water in the kitchen sink.
Is this a symptom of the new plumbing? Can we expect it to clear up after the new plumbing is completed?
Best Answer
The Most common cause of this when there are renovations is cross connection of the hot and cold lines, this can be caused by
The shower/bath (or other similar fixtures with a breaching piece) are capped with wall caps (or spindles that don't have a washer in them) and the water can circulate between the hot and cold pipes.
The "stubs" under the sink are connected via a pipe externally till the plumber comes back.
The Plumber has cross connected the pipes in the wall (Damn!)