If you’re thinking about switching to solar water heating, one of the first questions is: “What size system do I need?”
Here’s a quick guide to help you decide.

1. Estimate Your Hot Water Usage

Your daily hot water demand depends on your household size and habits:
– 1–2 people: 50–100L tank
– 3–4 people: 120–200L tank
– 5–6 people: 200–250L tank
– 7+ people: 300L or more
If your family enjoys long showers or frequent laundry and dish washing, consider going one size larger.

2. Know the Types (4 types hot selling solar hot water from riwatt.)

1). Compact High-Pressure Solar Water Heater
This model is known for its efficiency and durability. Its vacuum tubes use fast heat transfer heat pipes, which absorb sunlight and convert it into thermal energy.
Conductive aluminum fins transfer this heat to a copper manifold, where the medium circulates between liquid and gas phases for optimal efficiency.

Key Advantages:
* Suitable for cold regions since no water enters the vacuum tubes.
* Independent tube operation prevents freezing or rupture in winter.
* Long service life, with heat pipe vacuum tubes lasting 15+ years.

2). Non-Pressure Solar Water Heater
Light weight and simple in structure, this type uses glass vacuum tubes to capture solar energy. It requires no external power source, making it the most cost-effective solution for households.

Key Advantages:
* Excellent insulation and energy utilization.
* Simple design with easy installation.
* Affordable and efficient hot water supply.
* Also suitable for colder regions thanks to its reliable insulation.

3). Split Solar Water Heater
Designed especially for modern villas, the split system separates the solar collector from the storage tank, ensuring aesthetics and high performance.

Key Features:
* High-efficiency vacuum tubes.
* High-pressure, heat-resistant storage tank.
* Corrosion-resistant aluminum alloy frame.
* Intelligent control system for reliable operation.
This option combines performance with elegance, making it ideal for residential projects where both efficiency and design matter.

4). Flat Plate Solar Water Heater
Flat plate systems are valued for being durable, sturdy, and versatile. They are constructed with a windproof frame, titanium absorber, fiberglass insulation, and glass cover, ensuring excellent thermal performance.

Applications:
* Household hot water
* Swimming pools and hot tubs
* Hot spring and process heating
* Agricultural and commercial systems

Key Advantages:
* Long service life with strong antifreeze capability.
* High ROI with reliable performance.
* Intelligent design for various climates and usage needs.

3. Match Collector Size

For every 100L of tank capacity, you’ll need 1–1.5m² of solar collector area (or equivalent to 10 ~15 pcs vacuum tube as solar collectors).
Example: 200L tank → 2–3m² solar collector(or equivalent to 20 ~24 pcs vacuum tube as solar collectors).
Example: 300L tank → 4–5m² solar collector(or equivalent to 30 ~36 pcs vacuum tube as solar collectors).

4. Factor in Your Climate

– Warm climates: Smaller systems are sufficient.
– Cold climates: Larger tanks and better insulation are recommended.

5. Plan Ahead

If you expect your family or hot water usage to grow, choose a slightly larger system. Also, check your available roof space for the collectors.

Final Tip

The right size system ensures enough hot water, maximum energy savings, and long-term efficiency.

At Riwatt Solar Co.,Limited,we offer a full range of solar water heaters—from compact models to large-capacity systems.
Our experts can help you select the perfect one for your home and climate.
Contact us today to start saving energy and enjoying reliable solar hot water every day!

Mobile: +86 180 0660 1051
Inquiry E-Mail: info@riwatt.com
Web:www.riwatt.com polish it,