Planning your dream spa shower is more than just determining style, colour scheme, finishes, and features.  One of the most important decisions you will make is whether you want to install a Thermostatic or Pressure-Balancing shower valve.  Many consumers aren’t clear about what the differences are between these two shower types. Let’s take a look at what sets a Thermostatic Shower apart from a Pressure-Balancing Shower, the benefits of a thermostatic shower and some brands who manufacture Thermostatic Showers. 

Thermostatic shower vs. Pressure-Balancing  Shower: What’s the Difference?


Pressure-Balancing  Shower

The pressure-balancing shower valve was the first significant departure from the two-handle shower valve.  These primitive valves could produce water at temperatures exceeding 140F - well above that known to cause injury.  Even when the user adjusted the temperature to their comfort level, cold water drawn from another fixture limited that produced by the shower valve - causing a sudden and persistent flow of scalding water to douse the user.

Pressure-balancing valves eliminated this problem in two simple ways.  Firstly, they can be installed so that they cannot be adjusted to produce scalding water.  Second, and most importantly, they contain a mechanism called a pressure-balancing spool.  When another fixture draws water, the spool moves - controlling the flow of hot or cold water.  Pressure balancing technology has existed for many years, but water temperature control provisions did not appear in the Canadian National Plumbing Code until 2001.

    Safer and more comfortable than their predecessor, pressure balancing valves are a reliable and cost-effective option and can be outfitted in a wide variety styles and finishes


Thermostatic Shower

Thermostatic showers provide consumers with peace of mind when it comes to the temperature of their shower.  This shower works by constantly making slight adjustments to changes in water pressure, in order to ensure that you receive a consistent and even shower temperature.  Additionally, thermostatic showers produce greater flow rates than conventional pressure-balancing showers - necessary to those considering multiple body spray options.                            

When you turn the tap on, the settings will instantly deliver your desired temperature.


Pros and Cons of a Thermostatic vs. Non-Thermostatic Shower


Thermostatic Shower

Non-Thermostatic Shower


  • Consistent temperature   
  • Increased energy efficiency
  • Accurate return to set temperature
  • Temperature you want every time
  • Higher flow rates
  • Lower initial cost
  • Scald Protection
  • Moderate comfort


  • Greater initial cost
  • Fiddling with knobs to achieve desired temperature
  • No temperature memory
  • No additional scald prevention

Thermostatic Shower Options In Stock:



Many consumers are choosing to install a Thermostatic Shower in their spa bathroom, in order to achieve their great benefits.  With a wide selection of styles, and finishes available you are sure to find the Thermostatic Shower that suits your budget and design aesthetic at Plumbing Online Canada.


Kenneth255 on

The pressure-balancing shower valve was the first significant departure from the two-handle shower valve.

Kenneth255 on

Pressure balancing the shower is valve is sensitive and when fix the valve carefully and doing the work by professional plumber. Customer Support on

Hi Brian.

To make the adjustment you seek, please see Step 7 on Page 18 of this handy guide from Kalia:

I hope this helps – thanks for shopping at


Kevin Customer Support

Brian Champlin on

How do I adjust the anti-scald or high temperature limit on a kalmia thermostatic mixing valve?
The shower is hot initially then the mixing valve kicks in and it’s only warm after that.

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