Reliance 22mm 2 Port Zone Valve
Reliable Heating and Hot Water Zone Control
The Reliance 22mm 2 Port Zone Valve provides automatic control of water flow.
It can isolate a heating zone or other suitable equipment when required. Therefore, it works well in domestic and light commercial heating systems.
The valve also suits hot water control applications. As a result, installers can use one proven valve design across several common heating layouts.
Genuine Reliance RWC Zone Valve
This valve is a genuine Reliance Valves / RWC product.
The manufacturer part number is ZONE250305.
Therefore, installers can identify the exact model easily when replacing an existing valve.
Using the correct part number also helps avoid confusion with similar 22mm motorised valves.
22mm Copper Pipe Connections
The valve body suits 22mm copper pipework.
Reliance specifies this model for use with copper pipe only. Therefore, always check the surrounding pipework before ordering.
The 22mm size suits many domestic heating and hot water installations.
Detachable Motorised Head
The motorised head clips onto the valve body.
Therefore, servicing becomes easier if the actuator needs attention.
Reliance also states that the motorised head can retrofit onto some other manufacturers’ valve bodies. However, always confirm compatibility before fitting it to a different valve body.
Plug-and-Play Cable Connection
Reliance supplies a pre-moulded cable connection between the valve body and motorised head.
This helps simplify installation and future servicing.
In addition, the detachable arrangement allows engineers to disconnect the head without disturbing the complete valve body.
Strong Metal Manual Lever
The valve includes a metal manual operating lever.
This provides a robust way to operate the valve manually when required.
Therefore, installers can use the lever during commissioning, filling and servicing.
230V Heating Control
The motor operates from a 220-240V, 50/60Hz supply.
Power consumption is 5W.
Therefore, the valve integrates with suitable mains-powered heating controls and wiring centres.
Always use a qualified installer for electrical connections.
Suitable for Zoned Heating Systems
A 2-port motorised valve allows different parts of a heating system to operate independently.
For example, one valve may control a heating circuit while another controls hot water.
This arrangement can improve control across the property.
In addition, zoning can prevent unnecessary water flow through circuits that do not need heat.
Heating and Hot Water Applications
Reliance specifies ZONE250305 for:
- Central heating systems
- Domestic hot water control
- Heating zone isolation
- Light commercial heating
- Zoned heating systems
- Replacement motorised valve applications
The manufacturer specifies the valve for heating and hot water use only.
Ideal for Replacement Work
Motorised zone valves eventually need servicing or replacement.
Common reasons include:
- Motor failure
- Actuator failure
- Sticking valve mechanism
- Electrical faults
- Damaged manual lever
- Wiring problems
- System upgrades
- Heating control replacement
Using the exact ZONE250305 part number makes replacement identification easier.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Reliance Valves / RWC |
| Manufacturer Code | ZONE250305 |
| Product | 2 Port Motorised Zone Valve |
| Connection Size | 22mm |
| Pipe Compatibility | Copper Pipe |
| Power Supply | 220-240V AC |
| Frequency | 50/60Hz |
| Power Consumption | 5W |
| System Fuse Rating | 3A Maximum |
| Auxiliary Switch Rating | 3A 250VAC |
| Water Temperature | 5°C to 88°C |
| Maximum Differential Pressure | 0.69 Bar |
| Maximum Pressure | 6 Bar |
| Cable Length | 1m |
| Head | Detachable |
| Manual Lever | Metal |
| Manufacturer Guarantee | 2 Years |
6 Bar Maximum Pressure
Reliance publishes a maximum system pressure of 6 bar for this valve.
In addition, the maximum differential pressure is 0.69 bar.
Always check the heating-system operating conditions before installation.
5°C to 88°C Water Temperature
The published water temperature range is 5°C to 88°C.
Therefore, the valve covers normal operating temperatures across many heating and hot water systems.
1 Metre Cable
The motorised valve includes a 1 metre cable.
This gives installers useful flexibility when connecting the valve to a suitable wiring centre or heating control.
2 Port vs 3 Port Zone Valve
A 2-port valve controls flow through one pipe route.
Therefore, it works well when individual heating circuits need separate isolation.
A 3-port valve directs water between different routes.
The correct option depends on the heating-system design.
Why Buy From Kudos Trading?
Kudos Trading supplies genuine Reliance RWC heating controls and plumbing products throughout the UK.
We also stock motorised valves, wiring centres and replacement actuator heads.
Therefore, installers can source several heating-control components from one supplier.
In addition, we have supplied underfloor heating products to the UK for over 26 years.
Frequently Asked Questions
What Is the Reliance ZONE250305?
ZONE250305 is the manufacturer part number for the Reliance 22mm 2 Port Motorised Zone Valve.
What Voltage Does the Valve Use?
The valve operates from 220-240V AC at 50/60Hz.
Power consumption is 5W.
Does the Motorised Head Come Off?
Yes.
The Reliance valve uses a clip-on detachable motorised head. Therefore, engineers can remove the head for servicing.
Can I Replace Just the Actuator Head?
Yes, where the replacement head matches the valve body.
Reliance also produces a dedicated spare actuator for this valve.
Always confirm compatibility before ordering.
What Size Pipe Does It Fit?
This model fits 22mm copper pipe.
Reliance specifies copper pipe only for ZONE250305.
Is It Suitable for Central Heating?
Yes.
Reliance specifically lists the valve for central heating and hot water applications.
Can It Control Hot Water?
Yes.
The valve can control water flow within a compatible domestic hot water heating arrangement.
What Is the Maximum Water Temperature?
The maximum published water temperature is 88°C.
What Is the Maximum Pressure?
The maximum published system pressure is 6 bar.
Does It Have a Manual Lever?
Yes.
The valve includes a strong metal manual operating lever.
How Long Is the Guarantee?
Reliance provides a 2-year guarantee for this valve.
Related Products
- 28mm 2 Port Motorised Zone Valve
- 22mm 3 Port Motorised Zone Valve
- Actuator Head for 2-Port Motorised Valves
- Reliance 240V Wiring Centre
- Reliance Hot Water Timer – Black
- Reliance 240V Wired/RF Programmable Thermostat – Black
Next Working Day Delivery
Yes, we hold all our products in stock at our 7,000 sq ft Nottingham warehouse and at our 3,000 sq ft warehouse in Market Harborough.
Order before 12pm for dispatch using our tracked next-working-day DPD service.
Collection Available
You can always collect from our Nottingham location and help yourself to a free tea or coffee.
