|Maximum Temperature Setting|
|Heating Time During Energy Saving Mode|
|Heating Time During Quick Heating Mode|
|High Temperature Mode|
There are basically two types of water heaters
- Instant water heaters (electric and gas)
- Storage water heaters (electric and solar)
Heat pump water heaters use electricity to move heat from one place to another instead of generating heat directly. Therefore, they can be two to three times more energy efficient than conventional electric resistance water heaters. To move the heat, heat pumps work like a refrigerator in reverse.
While a refrigerator pulls heat from inside a box and dumps it into the surrounding room, a stand-alone air-source heat pump water heater pulls heat from the surrounding air and dumps it -- at a higher temperature -- into a tank to heat water. You can purchase a stand-alone heat pump water heating system as an integrated unit with a built-in water storage tank and back-up resistance heating elements. You can also retrofit a heat pump to work with an existing electrical water heater.
Heat pump water heaters require installation in locations that remain in the 40º–90ºF (4.4º–32.2ºC) range year-round and provide at least 1,000 cubic feet (28.3 cubic meters) of air space around the water heater. Cool exhaust air can be exhausted to the room or outdoors. Install them in a space with excess heat, such as a furnace room. Heat pump water heaters will not operate efficiently in a cold space. They tend to cool the spaces they are in. You can also install an air-source heat pump system that combines heating, cooling, and water heating. These combination systems pull their heat indoors from the outdoor air in the winter and from the indoor air in the summer. Because they remove heat from the air, any type of air-source heat pump system works more efficiently in a warm climate.
Heat pump water heater systems typically have higher initial costs than conventional storage water heaters. However, they have lower operating costs, which can offset their higher purchase and installation prices.
Before buying a heat pump water heating system, you also need to consider the following:
- Size and fitting
- Fuel and availability
- Energy efficiency
- Overall cost
Proper installation and maintenance of your heat pump water heating system can optimize its energy efficiency.
Proper installation depends on many factors. These factors include fuel type, climate, local building code requirements, and safety issues. Therefore, it's best to have a qualified plumbing and heating contractor (or geothermal heat pump system installer/designer) install your heat pump.
Do the following when selecting a qualified professional:
- Request cost estimates in writing
- Ask for references
- Check the company with your local Better Business Bureau
- See if the company will obtain a local permit if necessary and understands local building codes.
Periodic water heater maintenance can significantly extend your water heater's life and minimize loss of efficiency. Read your owner's manual for specific maintenance recommendations.
They can go anywhere, but since they cool the space they are in, it is best if they are in a garage or basement or large utility room that doesn’t need to stay warm. They will de-humidify the air so they are great for slightly damp basements.
When you call a heat pump installer for a visit and a quote on a heat pump system, they should do an audit of your insulation and building envelope to make sure the system would work and to identify any obvious insulation work needed. If they do not do this, you should talk to someone else before you purchase. You will save money and be more comfortable whatever heating solution you use if your house is well insulated, but heat pumps are more sensitive to poorly insulated homes because they do not have the brute force of a gas system. A gas furnace can supply very high heat to compensate for poor insulation, although that is a terrible waste of money and energy.
Heat Pump Water Heaters are the best option one has if one wants to save electricity. This is because its efficiency is increased as in addition to consuming electricity, it also takes up heat from the surroundings to heat the water up. So it means that the same amount of water will be heated up in lesser time than in a regular water heater, as total energy consumed is more in case of Heat Pump Water Heaters. How?
If a regular water heater consumes 1 kW to heat up a given quantity of water, a heat pump water heater, in addition to the 1 kW takes up heat from the surroundings amounting to 2.5 kW on the same 1 kW electricity consumed on an average. This means that on the same 1 kW electricity being consumed, a heat pump water heater provides 3.5 kW output (1 kW + 2.5 kW) to heat the same quantity of water. Please not that this value (2.5 kW) may vary according to the brand or specifications of the product you are buying. It can be lower than 2.5 kW and it can be higher than 2.5 kW as well. It entirely depends on the heater that you are buying. So it is advised that you go through the specifications of the product in detail before buying.
Let us come down to the part which concerns your expenses on the electricity consumed. The minimum capacity of a heat pump water heater that is readily available in market now-a-days is 50 litres. So let us assume the quantity of water you want to heat is 50 L. Here we consider the two water heaters, a regular water heater and a heat pump water heater.
The total number of electricity units consumed can be found out using a basic formula
Ideal Units for heating = Volume of Water x Temperature Difference x 0.0012
Here the volume of water is 50 L. Let us assume that the temperature of the tap water is 20 oC and you want to use it at 60 oC. So the temp difference is 40 oC (60-20).
|Regular water heater||Heat pump water heater|
|Number of electricity Units consumed = 50 x 40 x 0.0012 = 2.4 units||Number of electricity Units consumed = (50 x 40 x 0.0012) / 3.5 = 0.69 units|
So this means that where a regular water heater uses 2.4 units of electricity, a heat pump water heater uses 0.69 units. And how does it affect your expenses?
Let us assume the tariff is Rs 5 per unit.
|Expenditure on 1 unit = Rs 5||Expenditure on 1 unit = Rs 5|
|Expenditure on 2.4 units = 5 x 2.4 = Rs 12||Expenditure on 0.69 unit = 5 x 0.69 = Rs 3.45|
Suppose the water heater is used for 30 days
|Regular water heater||Heat pump water heater|
|Total number of units in 30 days = 2.4 x 30 = 72||Total number of units in 30 days = 0.69 x 30 = 20.7|
|Expenditure on 72 units = 5 x 72 = Rs 360||Expenditure on 20.7 units = 5 x 20.7 = Rs 103.5|
The prices of a regular water heater and a heat pump water heater will be different. Usually the price range of a regular water heater is in the range of Rs 10000- Rs 15000 and that of a heat pump water heater lies in the range of Rs 17000 – Rs 25000.
So let us assume the price of a regular water heater is Rs 13000 and that of a heat pump water heater is Rs 20000.
Then the difference in the cost of buying = 20000 – 13000 = Rs 7000
In a month (30 days) you are spending Rs 103.5 if you use a heat pump water heater and Rs 360 if you use regular water heater. So the savings = Rs 360 – Rs 103.5 = Rs 256.5
So how long will it take to recover Rs 7000?
(7000/256.5) = 27 months = 2.25 years (approximately)
It means that if you buy a heat pump water heater (which is costlier than a regular water heater of the same capacity) then in almost 2 years and a quarter, you will be able to recover the extra money you spent on buying the heat pump water heater. And after that, it will all be savings on electricity !
Heat Pump Water Heaters provide a very suitable and efficient alternative to the regular water heater. Here are a few benefits of using Heat Pump Water Heaters
- It can heat up large volume of water at a time. They come in different varieties having capacities upto 200 Litres (or more sometimes).
- These are highly cost effective as they consume lesser electricity to heat up the same volume of water than a regular water heater.
- They do provide service for a long time. Meaning? They have a long life.
- They can act as coolers as well as they tend to cool up the place where they are installed.
- Heat Pump Water Heaters are absolutely safe.
- The installation requires little effort. Also they are easy to maintain.
Since a heat pump water heater contains a refrigerant gas, it is important that the heating coils are protected against corrosion. Also since the refrigerant gas might not be environment friendly, so it is advised that it should be properly checked for its ill-effects on the environment.
Home with a solar panel array on the roof
The benefit of solar panels is that during the day when the sun is shining, your rooftop panels are harvesting solar energy and converting that energy to be used in your home as electricity. In many homes, power generated by the array that is not used in the home is credited back to you by your electric utility company and is used to offset your electric bill at the end of each month. Most homes will still have an electricity bill for power used overnight, during storms, or during periods of high use such as very hot periods of summer.
However, your heat pump is powered by electricity – and when you pair solar panels for electricity with heat pumps for heat (which use electricity for power), you are heating your home for an average of about 9 cents per kWh vs. 14.5 cents per kWh without solar, effectively reducing your cost to run your heat pump by almost 40% annually.