New construction/phase inspections?
2006 IRC P2713.3
Hydromassage tubs (with separate hot & cold control valves) don’t have a temperature limit device such as the single lever tub/shower control. This
may lead to a hot water scalding.
Each year, approximately 3,800 injuries and 34 deaths occur in the home due to scalding from excessively hot tap water. The majority of these accidents involve the elderly and children under the age of five. (ref: U.S. CPSC)
As such the 2006 IRC recognizes the potential for injury and codified the need for a temperature limiting valve for hydromassage tubs.
[ref: 2006 IRC P2713.3 Bathtub and whirlpool bathtub valves. The hot water supplied to bathtubs and whirlpool bathtubs shall be limited to a maximum temperature of 120°F (49°C) by a water temperature-limiting device that conforms to ASSE 1070, except where such protection is otherwise provided by a combination tub/shower valve in accordance with Section P2708.3.]
A typical temperature limit valve link is below. One builder in my area installs them in the sink vanity cabinet to make it accessible as it is adjustable and from there the water line goes to the hydromassage tub.
Importance Factor? (your decision):
The temperature limit controls for the combination tub/shower controls started in 1993/1994 (3210.4 of the CABO One & Two Family code). The lack of or inoperable tub/shower temperature safety valves may be a recognized safety hazard which can lead to personal injury.