Master Mixing Valve
Placed directly at the water heater, master mixing valves thermostatically combine hot and cold water to achieve the appropriate temperature for the hot water distribution system.
In order to protect against Legionella bacteria growth in the tank, the MV17 master mixing valve stores water at 140°F or higher before delivering it to the distribution system at approximately 120°F. Tempering valves then provide a final adjustment at the point of use to ensure the water is delivered at the desired temperature.
The MV17 Series master mixing valve is offered in 5 sizes, making it ideal for applications both small and large. Select the model with the capacity and performance best suited to meet your needs!

Features & Benefits
- Minimum flow rate of just 0.1 GPM
- IAPMO-certified minimum flow rate of 0.5 GPM far exceeds ASSE 1017 requirements
- Brass and paraffin wax design for more reliable, consistent performance compared to competitors’ bi-metal valves
- Integral strainers accessible for cleaning
- Two lockable full port brass ball valves for inlet connections included
- Allen wrench setpoint adjustment, with a locknut to prevent unauthorized access
- Outlet temperature gauge optionally available
Downloads
Specifications
| Product Type | Mixing Valve, Thermostatic Balancing Valve |
| Material | Brass Casting with Corrosion-Resistant Internal Components, Rough Chrome-Plated |
| Compliance | UPC, ASSE 1017, CSA B125.3, No Lead - Federal Public Law 111-380 |
| Valve Size | 1/2" NPT Inlet & Outlet, 3/4" NPT Inlet & 1" NPT Outlet, 1" NPT Inlet & 1-1/4" NPT Outlet, 1-1/4" NPT Inlet & 1-1/2" NPT Outlet, 1-1/2" NPT Inlet & 2" NPT Outlet |
| Brand | Acorn ConTrols® |
| Flow Rate | 15 GPM @ 45 PSI, 45 GPM @ 45 PSI, 90 GPM @ 45 PSI, 150 GPM @ 45 PSI, 225 GPM @ 45 PSI |
| Max Operating Pressure | 125 PSI (861 kPa) |
| Max Hot Water Supply Temp. | 180°F (82°C) |
| Outlet Temp. Range | 100°F - 160°F (38°C - 71°C) |
| Connections | NPT |
| Patent | 9,898,017 |
Options
Models

MV17-1
Brass
15 GPM (56.8 LPM)
Inlet 1/2" NPT
Outlet 1/2" NPT
5-3/4" (146 mm) Length
Two 1/2" NPT Ball Valves

MV17CP-1
Chrome-Plated Brass

MV17-2
Brass
45 GPM (170 LPM)
Inlet 3/4" NPT
Outlet 1" NPT
8-1/2" (216 mm) Length
Two 3/4" NPT Ball Valves

MV17CP-2
Chrome-Plated Brass

MV17-3
Brass
90 GPM (341 LPM)
Inlet 1" NPT
Outlet 1-1/4" NPT
14" (356 mm) Length
Two 1" NPT Ball Valves

MV17CP-3
Chrome-Plated Brass

MV17-4
Brass
150 GPM (569 LPM)
Inlet 1-1/4" NPT
Outlet 1-1/2" NPT
14" (356 mm) Length
Two 1-1/4" NPT Ball Valves

MV17CP-4
Chrome-Plated Brass

MV17-5
Brass
225 GPM (852 LPM)
Inlet 1-1/2" NPT
Outlet 2" NPT
15" (381 mm) Length
Two 1-1/2" NPT Ball Valves

MV17CP-5
Chrome-Plated Brass














