
The RMC 15mm 1/2" 850kPa Expansion Control Valve is fitted to water heater inlets to relieve expansion pressure as water heats. By releasing pressure at the inlet, it helps protect the system and avoids purging heated water unnecessarily.
An expansion control valve is installed on the cold water inlet of a storage water heater to manage the pressure increase that occurs during heating. This RMC valve relieves that pressure at 850kPa, helping reduce wasted hot water and supporting safe, efficient operation of the hot water system.
RMC 15mm 1/2" 850kPa Expansion Control Valve is designed for use at water heater inlets, providing essential expansion safeguards. It is engineered to release pressure at the inlet, which conserves energy by preventing the unnecessary purging of heated water. The valve helps manage the pressure increase that occurs as stored water is heated.
It relieves expansion pressure at the water heater inlet as water heats.
It is a 15mm (1/2") valve.
It is set to relieve pressure at 850kPa.
The maximum working temperature is 99°C.
It is installed on the cold water inlet of a storage water heater to manage pressure increase during heating.
The model number is HX1507A.
Great quality
Good quality and arrived ahead of schedule. Very happy.
Brilliant Aussie deal
Been buying Rmc gear for years and this is one of their better ones. The RMC 15mm quality is excellent — everything was included and setup took under 10 minutes. Had it at the door in Brisbane within 2 days. My son immediately claimed it for himself so I had to order another. 10 out of 10.
No complaints at all
Exactly as described. Quick shipping. Would buy again.
Works perfectly out of the box
Was exactly what I needed for the price I paid. Arrived well packaged and was easy to set up straight away. Already recommended it to a friend who is also thinking of getting one.
Worth every cent
Did a lot of comparison shopping before buying here and I have no regrets. Best price I found anywhere and delivery was fast — 3 days to Melbourne. Product feels genuinely premium, not cheap at all. Packaging was solid too, box arrived in perfect shape. Will be back for more.
Does the job well
Rmc quality is always reliable and this was no exception. Fast delivery too.

