Are solar hot water systems worth it?


Are solar hot water systems worth it? For most homes, the short answer is: yes and yes. A well chosen solar hot water system or a heat pump may cost more to begin with, but for most homes they’ll be significantly cheaper to run than a conventional electric or gas system. That’s good for your bank account and good for the planet.

How many solar panels does it take to power a hot water heater? There are solar panels that absorb and produce 100-watts, and others 300-watts. So, to run a water heater that uses up to 1500-watts, you need 15×100-watts or 15×300-watts solar panels. For 15×300-watt solar panels, you only need 3 panels which will save you roof space and will be easier to install.

What are the disadvantages of solar hot water? 

Disadvantages of Solar Water Heaters
  • Compared to photovoltaic panels, solar thermal panels only heat water.
  • Solar heaters require sufficient roof space to accommodate them.
  • Solar water heaters require direct sunlight to function.
  • The system does not function on cloudy, rainy, or foggy days.

How big of a solar hot water system do I need? As a rule of thumb, a relatively water efficient household is looking at a system size of 75 litres per person. A typical solar hot water panel is 2 square metres and will supply 150 litres. So a typical 4 person family will need a system sized at 300 litres which has 2 panels.

Are solar hot water systems worth it? – Additional Questions

Do solar hot water systems work in winter?

If you’re considering installing a solar hot water system, you’re probably wondering – will my solar hot water work during winter? In short: yes. Even if you live in an area where you temperatures drop below zero, solar hot water systems are built to accommodate harsh winter conditions.

Does solar hot water stay hot overnight?

Does solar hot water work at night? Your solar hot water system works hard during the day to heat water that’ll still be hot enough for use at night and all through to the next morning.

What size hot water system do I need for a family of 5?

Every family and home is different, so you need to make sure you choose carefully when deciding what size hot water system to install.

Electric hot water system.

Number of people Peak usage Tank size
5 – 8 Low 250
3 – 6 High 315
Low 160
2 – 4 High 160

How many Litres is a solar shower?

It can hold up to 20 litres of water. To use it, just leave it in the sun for a couple of hours, hang up wherever suitable, then it’s good to use. This solar shower is made with a black material that easily absorbs the sun’s heat.

How many gallons is a solar water heater?

The average 40-square-foot (3.7-square-meter) solar collector system provides 38 gallons (144 liters) of hot water daily, about 60 percent of the daily water needs for a family of four.

Do you need solar hot water if you have solar panels?

“For those looking for further cost efficiencies in their home, Solar PV can be used to heat water, you do not need to install specific solar hot water systems, which our study has shown are less cost efficient,” said Ecoelectric managing director Jeff Wehl.

What is the most efficient hot water system?

Electric heat-pump water heaters

An electric heat-pump hot water heater uses much less electricity than an electric storage water heater, and are the most efficient hot water systems on the market.

What is the best hot water system to use with solar panels?

Solar PV Diverter

This is the cheapest in terms of upfront costs, most reliable and lowest maintenance system, for heating hot water from the sun. If you have it put in at the same time as your solar panels, it could only cost you about a thousand dollars extra.

What are the three major types of solar hot water systems?

What are the 3 main types of solar hot water systems? The three main types of solar hot water systems are evacuated tube, flat plate, and heat pump systems. Both flat plate and evacuated tube systems work by installing a solar thermal collector on a roof or an area with a large amount of exposure from the sun.

Does solar water heater works in rainy season?

Yes,it works even on cloudy days. Hot water can still be generated during the monsoon as the heater will use diffused radiation available in the atmosphere.

Does solar water heater need a pump?

Solar hot water heaters are split into two broad categories: passive and active. The primary difference between the two is that active systems require circulating pumps to move water, and passive systems rely on gravity to move water.

How hot can solar hot water get?

The solar water heater can heat the water up to 180 to 200 degrees Fahrenheit. The mixing station can mix the water to bring it to a safe temperature to use. The water that we use in our house in our faucet and shower is typically around 120 to 125 degrees Fahrenheit.

Do solar water heating systems overheat?

But what happens when there is too much of a good thing? Solar water heating systems can and do overheat, creating both inconvenience and cost for the customer.

How much money does a solar hot water system save?

In fact, according to the Department of Environment and Climate Change NSW, a solar hot water system can save you up to 75% on your water heating costs when compared to electric storage heaters or gas boilers.

How much is a solar water heater system?

Solar water heaters for homes cost $3,000 to $9,000 with installation. Active solar water heating costs $2,300 to $6,000, and passive thermal water heaters cost $1,000 to $3,700 for the system alone. Solar hot water collector panels cost $800 to $1,500 each. Solar storage tank prices are $1,000 to $2,800.

How long do solar water heaters last?

The average life expectancy of certified solar water heating systems is 20 years, much longer than standard gas or electric storage water heaters.

How long does it take to install a solar water heater?

Solar water heater installation averages $70 per hour by a trained professional. The installation of these systems can be much more involved than that of other water heaters. A conventional style typically won’t take more than one day to install, whereas solar units may take several days.