Common Solar Water Heater Issues Explained**

A solar water heater is one of the most efficient ways to enjoy consistent hot water while reducing electricity costs. However, many homeowners in UAE villas sometimes notice low hot-water pressure, while the cold water flows normally.

If you’re facing this problem, the issue usually comes from one of three components:

1. NRV (Non-Return Valve)
2. Mixing Valve (Thermostatic Mixing Valve)
3. Circulation Pump

At PROUDI SOLAR SOLUTION – Proudi Trading FZE, we often troubleshoot these exact problems for villa owners across Sharjah, Dubai, and the Northern Emirates.

Below, we explain each issue in simple terms so you know what to check and when to call a technician.

1. Faulty NRV (Non-Return Valve)

The NRV is a small but essential device installed on your hot-water line. Its job is to allow water to flow in only one direction—toward your villa.

If the NRV becomes blocked, stuck, or installed incorrectly, it restricts the hot-water flow, causing:

• Very low pressure in hot-water taps
• Hot water taking too long to reach the bathrooms
• Fluctuating temperature or flow

A damaged NRV is one of the most common reasons for low hot-water pressure in villas with solar heaters.

Solution:

A technician should remove, clean, or replace the valve. NRVs are inexpensive and fixing them usually restores normal pressure immediately.

2. Mixing Valve Malfunction

Every solar water heater system uses a thermostatic mixing valve to safely blend hot water from the tank with cold water so it doesn’t come out too hot.

When this valve gets clogged with scale, becomes rusty, or fails internally:

• Hot-water pressure drops
• Only warm water comes out, even if the tank is hot
• Temperature becomes inconsistent

Because UAE water contains minerals, scaling is very common inside mixing valves.

Solution:

Cleaning or replacing the mixing valve restores proper pressure and stable temperature.

3. Circulation Pump Not Working Properly

If your villa uses a circulation pump to deliver hot water faster to distant bathrooms, low pressure may indicate that:

• The pump is weak
• Air is trapped in the loop
• The controller or sensor is faulty
• The pump is completely non-operational

Without proper circulation, the system struggles to push hot water through the pipes—especially to upper floors.

Solution:

A technician can check the pump pressure, remove air locks, or replace the unit if needed.

When Should You Call a Technician?

If you notice:

• Hot water is coming slowly
• Pressure is weak only in hot-water lines
• Your solar tank is heating, but taps output is poor

Then it’s time to have the system inspected.

Most issues are minor but need proper diagnosis to prevent long-term damage or inefficiency.

PROUDI SOLAR SOLUTION – Your Trusted Solar Water Heater Experts in the UAE

We specialize in troubleshooting, installing, repairing, and maintaining solar water heater systems for villas, commercial buildings, and industrial facilities.

📍 Store Address:

PROUDI SOLAR SOLUTION, Proudi Trading FZE

Behind Emirates Road, Office – Warehouse No. 1

Al Sajaa Industrial, Sharjah, United Arab Emirates

📧 Email: info@lightpink-magpie-620306.hostingersite.com

📞 Mobile: +971 56 43 05 251

If you’re experiencing low hot-water pressure, our team can diagnose the issue quickly and restore your system to peak performance.