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Homes & villas 2 min read

Solar Water Heater or PV Panels? The Difference and When to Choose Each

A solar water heater makes hot water; PV panels make electricity. We explain the difference, efficiency and cost, and when combining both is best.

GPS Engineering Team
Solar Water Heater or PV Panels? The Difference and When to Choose Each

Many people confuse solar water heaters with photovoltaic (PV) panels. Both use the sun, but for completely different jobs. Choosing correctly — or combining them — can save you more than you expect.

Key takeaways

  • A solar water heater turns sunlight straight into heat for water, very efficiently.
  • PV panels make electricity for every load, including electric water heaters.
  • For hotels and hospitals with high hot-water demand, combining both is ideal.
  • For homes: a solar water heater for water, PV for AC and other loads.

Head-to-head

Criterion Solar thermal heater PV panels
Produces Hot water Electricity
Use Showers, kitchens, laundry Every appliance
Efficiency High for water heating 20%–23% to electricity
Space Relatively small Larger
Net metering No Yes
Maintenance Scale prevention, valve checks Cleaning, electrical checks
70%approx. of water-heating energy a solar heater can supply in Egypt
1heater per 4–5 people, approx. (200 litres)
25years PV panel life

When to choose a solar water heater

  • High hot-water demand: hotels, hospitals, clubs, student housing.
  • A home relying on an electric or gas water heater.
  • Limited roof space you want to use for the biggest impact on hot water.

When to choose PV

  • High electricity bills from AC, appliances and machinery.
  • You want to benefit from net metering.
  • Industrial and commercial facilities.

What about heating water with solar electricity?

You can run an electric heater from PV, or use a high-efficiency heat pump powered by solar electricity — an excellent option when space is limited or you want one system for everything.

How much would your plant save?

Get system size, cost and expected savings in under a minute.

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GPS

GPS Engineering Team

GPS engineers have designed and built solar plants across Egypt for 15+ years. Here they share what they learn in the field.

Frequently asked questions

Does a solar water heater work in winter?

Yes, with lower output on cold days, which is why most units include an electric backup element.

Does hard water affect solar heaters?

Yes. Scale reduces efficiency, so indirect systems or filters and regular maintenance are recommended.

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