Ensuring Safety, Efficiency, and Long-Term Reliability
Electric storage hot water heaters are a vital part of modern homes, providing consistent hot water for daily use. However, many homeowners overlook one critical component that directly affects safety, efficiency, and product lifespan: the pressure reducing valve (PRDV).
This article explains what a PRDV is, why it matters, and why every electric storage water heater should be protected by one, especially in Singapore.
What Is a Pressure Reducing Valve (PRDV)?
A pressure reducing valve is a plumbing device designed to regulate incoming water pressure. It automatically reduces high mains water pressure to a safe, controlled level before the water enters your appliances.
This is particularly important for electric storage water heaters, which are designed to operate within a specific pressure range.
How Does a Pressure Reducing Valve Work?
A PRDV continuously monitors incoming water pressure and adjusts internally to maintain a constant, preset outlet pressure.
Even if the mains supply pressure fluctuates or spikes, the valve ensures that only safe pressure enters your water heater and plumbing system.
Why Install a PRDV for Your Electric Storage Water Heater?
1. Prevents Damage and Extends Heater Lifespan
Excessive water pressure places constant stress on internal components such as:
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The inner tank
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Valves and fittings
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Pipe joints and seals
Over time, this can lead to leaks, ruptures, and premature failure. A PRDV protects your water heater by keeping pressure within safe operating limits, significantly extending its service life.
2. Improves Energy Efficiency
High water pressure forces the heater to work harder, increasing:
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Energy consumption
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Heating cycles
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Electricity costs
By regulating pressure, a PRDV allows the heater to operate more efficiently, reducing unnecessary energy usage and lowering utility bills.
3. Maintains Stable Water Temperature
Fluctuating water pressure often results in inconsistent water temperatures during use. With a PRDV installed:
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Pressure remains stable
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Heating performance is consistent
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Hot water delivery becomes more comfortable and reliable
4. Protects Your Entire Plumbing System
High pressure does not only affect the water heater. It can also damage:
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Pipes
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Taps and mixers
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Other household appliances
A PRDV acts as a protective barrier, reducing wear and tear across your entire plumbing system and helping you avoid costly repairs.
Isn’t Water Pressure Already Controlled at the Main Supply?
In Singapore, water pressure standards are regulated, and HDB Town Councils or Condo Management (MCST) can assist in checking whether your home’s water pressure meets national recommendations.
However, in practice:
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Pressure adjustments may take time
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Requests may be rejected if pressure reduction affects other units (e.g. higher floors reporting weak pressure)
As a result, relying solely on main supply regulation is not always effective.
What If I Don’t Want to Reduce Water Pressure for the Whole House?
Many homeowners prefer strong water pressure for showers and taps. If that’s the case, the best solution is:
👉 Install a PRDV directly at the cold-water inlet of your electric storage water heater
This approach:
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Protects the heater only
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Maintains high pressure for the rest of the house
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Is fully compliant when installed correctly
Any licensed plumber in Singapore can carry out this installation safely.
Legal Requirements and Penalties for Non-Compliance
Always engage a licensed plumber for any plumbing modifications involving water heaters.
Under Singapore regulations, improper plumbing work may result in serious penalties:
PUB Plumbing Violations
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Fines: up to SGD 10,000
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And/or up to 3 months’ imprisonment
(Public Utilities Act, Chapter 261, Section 40A)
Final Takeaway
Installing a pressure reducing valve is not optional—it is essential for:
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Safety
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Energy efficiency
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Consistent performance
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Long-term durability of your electric storage water heater
If you want maximum protection without compromising household water pressure, a dedicated PRDV at the heater inlet is the smartest and safest solution.