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Residential Solar Water Heater Vs Electric

Views:0     Author:Site Editor     Publish Time: 2019-11-05      Origin:Site

Water heaters are an essential part of every home, and every family will be listed on the must-buy list when it is renovated. After all, everyone needs a bath to keep it clean, or winter does not let cold water hurt their fingers. At the time of purchase, people tend to choose between residential solar water heaters and electric water heaters. So what are the pros and cons of each? This article will introduce you to the specific information of the two.

You will know the following:

  • What is residential solar water heater

  • What is electric water heater

  • Differences between residential solar water heater and electric water heater


1、What is residential solar water heater

Residential solar water heaters are heating devices that convert solar energy into heat energy, heating water from low temperature to high temperature to meet the hot water use of people in life and production. According to the structure, they are divided into vacuum tube residential solar water heaters and flat panel residential solar water heaters, mainly vacuum tube residential solar water heaters, accounting for 95% of the domestic market share. The vacuum tube type domestic residential solar water heater is composed of heat collecting tubes, water storage tanks and brackets and other related parts. The conversion of solar energy into heat energy mainly depends on the vacuum heat collecting tube, and the vacuum collecting tube uses the principle of hot water floating on the cold water to make the water generate microcirculation. Get the hot water you need.

Different configurations offer different climate and latitude solutions at different costs.


2、What is electric water heater

A typical electrical unit is connected to a 220 volt circuit. To heat the water, the current is passed through a resistive heating element - usually two, one in the middle of the tank and one at the bottom.

Power is delivered to each component through a thermostat - a switch that senses water temperature. When the temperature drops, the switch closes to allow current to flow and opens when the temperature reaches a preset limit. The thermostat has a dial that sets the maximum water temperature - usually between 130 and 140 degrees, or as low as 120 degrees Fahrenheit to increase energy and burn protection.

When the hot water tap is turned on, cold water enters the water tank through the dip tube, and the temperature drop triggers the thermostat and the bottom components. When the water at the top of the tank is replaced by cold water, the temperature of the top thermostat drops and its components act. When the faucet is turned off, the heating element continues to carry current until the thermostat is satisfied.


3、The difference between the two water heaters

A. The difference in use:

The electric water heater can be either stored or instantaneous, and uses electricity to heat the indoor hot water supply.

The electric water heater can be either stored or instantaneous, and uses electricity to heat the indoor hot water supply.


B. Different working principle

Electrical energy is converted into heat.

The light from the sun is converted into heat. The collector plate (battery panel) collects sunlight and converts it into heat. This heat is then transferred to the water and passed through the tube below the collector plate.


C. Component difference

Electric Water Heater

a) Storage Heater:

Insulated storage tank

heating element

water connections (inlet/outlet)


b) Instantaneous Heater:

insulated vessel

heat exchanger

water connections

Solar Water Heater

collector to collect solar energy

Insulated storage tank to store hot water


D. Different advantages

Electric Water Heater 

No local emissions

No carbon monoxide is burning

No gas leak

Easy installation

Lower purchase and installation costs

The setup cost is lower because no exhaust pipe is needed (no fuel is burned)

It can be confined to a small space, avoiding excessive floor space costs

It can safely prevent explosion

It only loses 1% of stored heat per hour

Need less maintenance

Solar Water Heater

Solar heaters use free natural resources to save on electricity bills

Solar energy is renewable and clean energy

Easy to install and less maintenance

They are efficient, about 80% of the radiation is converted into heat

Longer life

More suitable for big families

In a few places, users will receive compensation from the government for generating their own heat from renewable resources (the sun).

Water is also heated on a cloudy day because the heater uses diffusion energy to heat the water in the atmosphere.

Hot water can be used even during power outages


E. The disadvantages are different:

Electric Water Heater 

Very expensive to operate

It takes some time to heat the water.

Its flow rate is low

Potential hazard of short circuit or blown fuse

Solar Water Heater

Need additional roof space to install residential solar water heaters

The operation of solar heaters depends on the availability of sunlight

Need annual maintenance

Hot water is not available all year round. Therefore, it needs to be backed up on a cloudy day.


Residential solar water heaters and electric water heaters have their own advantages and disadvantages in application, but it must be said that solar energy, such renewable energy, should be widely adopted. After all, solar energy should be more developed in the current shortage of materials. The more consumers adopt, the more smooth the development will be.


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