Thermostatic valve or pressure balance valve?
I am considering Delta 17 series or 17T series shower kit. 17 has pressure balance valve, while 17T has thermostatic valve and I need to buy each item separately because 17T series does not come with handheld shower head.
I know pressure balance valves safeguard against sudden and unexpected temperature shocks while in bath or shower. When a toilet is flushed or dishwasher or other faucets are turned on, it automatically balances hot and cold water pressure. Thermostatic valves allow you to precisely preselect your water temperature beforehand.
Does thermostatic valve also safeguard against sudden temperature shocks if dishwasher is turned on, toilet is flushed, or faucets are turned on? Is it better to choose thermostatic or pressure balance valve for a shower stall? I am living in the San Francisco bay area.
Any input is greatly appreciated.