Water Heaters and Energy Class: Which One Is Worth Choosing in 2025

In 2025, choosing an efficient water heater is not just about comfort—it's a real investment in energy savings and sustainability. With growing attention to energy efficiency, knowing the energy class of a water heater is essential to reduce consumption and access tax incentives.

This guide explains everything you need to know about water heaters and energy classes, how to read the label, which models to choose, and the best products available on Store PST.

What Is the Energy Class of a Water Heater?

The energy class is an indicator of an appliance's efficiency. For water heaters (also called boilers), the classification ranges from class G (least efficient) to class A+++ (most efficient).

The energy label includes information on:

• Annual energy consumption (in kWh)
• Tank capacity (liters)
• Noise level (decibels)
• Load profile (XS, S, M, L, XL)

Types of Water Heaters: Electric or Gas?

Electric Water Heater

This is the most common solution in homes. It can be:

• Instantaneous: heats water only when needed
• Storage: keeps hot water in a tank

The most advanced models, like the Ariston Velis Pro range, also include Wi-Fi control for smart energy management.

Examples available on Store PST:

• Ariston Velis Pro 50, 80, and 100 liters
• Ariston Velis Pro Dry Wi-Fi
• MIDEA Vertical 50 and 80 liters

Gas Water Heater

Perfect for homes with a gas system. It offers continuous hot water and fast heating. Among the catalog models, we highlight the Vaillant atmoMAG mini 144/1 I with 14 L/min capacity.

Why Energy Class Matters

• Lower bills: reduced electricity or gas consumption
• Longer lifespan: modern and reliable technologies
• Tax incentives: access to bonuses and deductions
• Lower environmental impact: fewer CO₂ emissions

Water Heater Consumption by Energy Class

Values are indicative and may vary based on usage and temperature settings.

How to Read a Water Heater's Energy Label

• Scale from A+++ to G
• Annual consumption in kWh
• Capacity in liters
• Noise level
• Load profile (e.g., M, L, XL)

Incentives and Tax Deductions for Efficient Water Heaters

• 50% Home Bonus for replacement during renovations
• Reduced 10% VAT on product and installation
• Bonus for smart devices such as Wi-Fi-enabled water heaters

Best Class A Water Heaters on Store PST

Explore all available models on Store PST

Frequently Asked Questions

What is the best energy class for a water heater?

Classes A and A+ offer the best balance between consumption and performance.

Is an electric or gas water heater better?

It depends on available systems and usage frequency. Electric heaters are easier to install.

How do I recognize a low-consumption model?

Check the energy label and look at the annual consumption in kWh.

Are there smartphone-controlled water heaters?

Yes, the Ariston Velis Dry Wi-Fi models offer this functionality.

Conclusion

Choosing a high energy class water heater is the ideal solution to reduce consumption, improve comfort, and benefit from the incentives available in 2025.

Need help choosing?
Call us at 011 942 2006 or email us at supporto@storepst.com

Go to the water heater section on Store PST