Help understanding pressure balanced vs thermostatic valves for shower

Hello,

 
 
 
 

I’m shopping for a couple new tub/shower faucets, as we have the old two handle faucets in both bathrooms and both sets are pretty well shot. I was looking at Delta, and just trying to get more information on what pressure balanced vs thermostatic (Delta’s TempAssure) valves are, since they are both available as single handle faucets (a volume control and a temp control, both on a single faucet)

 
 
 
 

We have 4 kids, so the risk of a toilet flushed while showering in the morning is reasonable – which is what I understand the pressure balancing valve will prevent scalding. What’s the thermostatic valve do? Is it worth the extra money?

 
 
 
 
 
 

Here’s one for example:

 
 
 
 

http://www.amazon.com/T17T478-Leland…lta+tempassure

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Help understanding pressure balanced vs thermostatic valves for shower

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