When buying a tankless water heater, most people don’t know what size tankless water heater they need.
If you are looking to install tankless electric water heater and you’re unsure of which size you should buy, here are some factors you should take into account:
- The size of your house
- Flow Rate (GPM): How much hot water you will need at any given time
- Temperature Rise (ΔT): The difference between the incoming cold water temperature and the desired temperature
Your Household Size
If water heater is too small, it will result in it not being able to produce enough hot water for your household demand. For example, you might not be able to run more than one shower at a time, especially in the freezing winter.
On the other hand, water heater is too large, it will end up being more costly than necessary, since you will be paying more upfront for the larger size (although it could be useful if you plan to upsize your home later).
Hence, to work properly, a tankless water heater needs to be just the right size to meet your home's hot water demand.
Rate of Water Flow
Tankless water heaters are often referred to as demand water heaters. On-demand refers to having continuous hot water output for as long as the hot water tap is open. However, having multiple hot water taps open together will reduce the hot water output. Having too many hot water taps open at once will produce lukewarm water if the tankless water heater’s output capacity is exceeded.
To help you estimate the flow rates of most of your faucets, we shared some typical flow rates below. The actual flow rates may be different for your house and different appliances.
Temperature Rise
After you have calculated the flow rate of every faucet in your house, you must now determine how much heat your heater needs to generate to give you the required heat in your water outlets. We’ll take into consideration the temperature of the water that flows into your home and the temperature of the water that you want to flow out of your tap to determine the required temperature rise.
You might still have some questions relating to the size of instant electric water heater you need, please let us know in the comments below.
We are a professional manufacturer of instant electric water heater and electric water tap, which is located in Shunde, the hometown of producing electric appliances. We are a set of manufacture, research and development, marketing integrated company.
We introduced a series of advanced production and detection facilities since foundation, with annual production capacity of million sets, the products are exported to north and south America, Europe, and other countries all over the world. Owning the best OEM and ODM exportation, technology and quality, we have become one of the most professional manufacturers of instant electric water heater and electric water tap in China.
JNOD insisted on developing with technology innovation, we possessed of several national famous technicians and had invented multiply product patents. We strictly implemented the ISO international quality management system, produced all the main parts and components independently, and the products passed the CCC, CB, CE, ETL(UL standard) certification with reliable guaranteed quality. In October 2021, JNOD Testing Centre achieved CNAS accrditation, being recognized by the National Laboratory, becoming one of the first enterprises with national accreditation laboratory qualifications in the electric water heater industry.
Our sales team have extensive experience of oversea markets.
We provide sincere and professional services, including OEM/ODM services, technology support, market analysis, usage of design and composition of installation. We have succeeded in providing marketing consultancy services and business solutions for our customers from over 50 countries. With tailor-make solution of hot water supply base on customers market demand, we helped many customers obtain great sales performance and were highly regarded.
Make the worlds best products, create the international top brands are the pursuit and dream of JNOD.
Let’s look forward to the future, we sincerely invite you to cooperate with us and achieve win-win together for a better tomorrow.
ODM
Major in providing required products for the customers with our strong capability of research and development on ODM basis.
OEM
Achieve customer’s own idea and design for the products and mass production.
JNOD BRAND
JNOD do self-owned brand in China domestic and the oversea market, in addition, we have authorized brand agent in Argentina.
We are a professional manufacturer of instant electric water heater and electric water tap, which is located in Shunde, the hometown of producing electric appliances. We are a set of manufacture, research and development, marketing integrated company.
We introduced a series of advanced production and detection facilities since foundation, with annual production capacity of million sets, the products are exported to north and south America, Europe, and other countries all over the world. Owning the best OEM and ODM exportation, technology and quality, we have become one of the most professional manufacturers of instant electric water heater and electric water tap in China.
JNOD insisted on developing with technology innovation, we possessed of several national famous technicians and had invented multiply product patents. We strictly implemented the ISO international quality management system, produced all the main parts and components independently, and the products passed the CCC, CB, CE, ETL(UL standard) certification with reliable guaranteed quality. In October 2021, JNOD Testing Centre achieved CNAS accrditation, being recognized by the National Laboratory, becoming one of the first enterprises with national accreditation laboratory qualifications in the electric water heater industry.
Our sales team have extensive experience of oversea markets.
We provide sincere and professional services, including OEM/ODM services, technology support, market analysis, usage of design and composition of installation. We have succeeded in providing marketing consultancy services and business solutions for our customers from over 50 countries. With tailor-make solution of hot water supply base on customers market demand, we helped many customers obtain great sales performance and were highly regarded.
Make the worlds best products, create the international top brands are the pursuit and dream of JNOD.
Let’s look forward to the future, we sincerely invite you to cooperate with us and achieve win-win together for a better tomorrow.
ODM
Major in providing required products for the customers with our strong capability of research and development on ODM basis.
OEM
Achieve customer’s own idea and design for the products and mass production.
JNOD BRAND
JNOD do self-owned brand in China domestic and the oversea market, in addition, we have authorized brand agent in Argentina.
We are a professional manufacturer of instant electric water heater and electric water tap, which is located in Shunde, the hometown of producing electric appliances. We are a set of manufacture, research and development, marketing integrated company.
We introduced a series of advanced production and detection facilities since foundation, with annual production capacity of million sets, the products are exported to north and south America, Europe, and other countries all over the world. Owning the best OEM and ODM exportation, technology and quality, we have become one of the most professional manufacturers of instant electric water heater and electric water tap in China.
JNOD insisted on developing with technology innovation, we possessed of several national famous technicians and had invented multiply product patents. We strictly implemented the ISO international quality management system, produced all the main parts and components independently, and the products passed the CCC, CB, CE, ETL(UL standard) certification with reliable guaranteed quality. In October 2021, JNOD Testing Centre achieved CNAS accrditation, being recognized by the National Laboratory, becoming one of the first enterprises with national accreditation laboratory qualifications in the electric water heater industry.
Our sales team have extensive experience of oversea markets.
We provide sincere and professional services, including OEM/ODM services, technology support, market analysis, usage of design and composition of installation. We have succeeded in providing marketing consultancy services and business solutions for our customers from over 50 countries. With tailor-make solution of hot water supply base on customers market demand, we helped many customers obtain great sales performance and were highly regarded.
Make the worlds best products, create the international top brands are the pursuit and dream of JNOD.
Let’s look forward to the future, we sincerely invite you to cooperate with us and achieve win-win together for a better tomorrow.
ODM
Major in providing required products for the customers with our strong capability of research and development on ODM basis.
OEM
Achieve customer’s own idea and design for the products and mass production.
JNOD BRAND
JNOD do self-owned brand in China domestic and the oversea market, in addition, we have authorized brand agent in Argentina.
Would you like for taking a chilly shower? Perhaps not. If you have a large family, it can certainly be hard to get soaked in the morning . Oftentimes the hot water runs away before you please take a shower. A cold shower does not start the day on the wrong foot or so.
How can I get the endless hot water? Not only save energy but also can save cost . That sounds wonderful and amazing . We so happy to find it and this miracle device can be called tankless water heaters.
You can enjoy endless hot water just by opening the water valve, no need to wait to avoid wasting your time.
Comparing with the storage electric water heater and gas water heater, electric tankless water heater is the most suitable device to achieve purpose. Why we should go ? Please check the reasons:
Hot water on demand: Rather than traditional water heater, Hot water from electric tankless water heater come out in demand.
Cost savings: No need to pre-heating the water.
Energy efficiency: up the 97% high heating efficiency.
Never-ending hot water: Hot water keeping come out,endless hot water !
Space savings: Compact size，similar with ipad size，it takes up less space in your home than a large tank.
Longevity: long lifespan,up to 10 years！Tankless heaters usually last longer than older traditional tanked heaters, and you don’t have to worry about them bursting and spilling water all over your basement.
JNOD electric tankless water heater can meets all your image of water heater . The most prominent advantage is the unparalleled constant temperature function, only difference of ± 1 ℃ . Very comfortable . Enjoying a hot water bath is so easy .
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