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What Size Tankless Hot Water Heater Do I Need?

When it comes to a tankless hot water heater, you want to make the right choice for your household. At French Connection Plumbing, we give our customers the information they need to feel confident with their decision. Our highly skilled, licensed plumbing technicians will recommend the best choice for your Tankless Hot Water Heater so you have hot water on demand throughout your house.

Experienced. Reliable. Honest. Hard Working.

Installation of a tankless water heater requires obtaining a building permit, and must comply with the current California Plumbing Code (CPC). Don’t risk costly mistakes, trust a professional, experienced, licensed plumber to instal your tankless water heater in Fair Oaks, Carmichael, Citrus Heights, and Sacramento area.

There’s a reason French Connection Plumbing has earned 5 Star reviews for best plumber!

Oops, that will cost you!

One of the biggest mistakes we see homeowners do, is try to tackle a job that’s way above their skillset. If it’s a simple fix, no worries. But the bigger jobs like, installing a tankless water heater should probably be left to a professional and experienced plumber. Our plumbing technicians are trained and experienced to handle even the most complicated tankless hot water heater installations.

Your Home Matters To Us

French Connection Pluming only hires hardworking, reliable technicians that have an extensive knowledge-base for all plumbing issues.

They’ll treat your home with respect while ensuring the job is done to your satisfaction.

Tankless Hot Water Heater Installation Professional Advice

Another mistake we see often when homeowners try the “do it yourself" (DIY) method, is buying a tankless water heater system that is too weak to sustain the hot water demand in their household needs. If you are going to try and order one yourself, make sure you seek professional advice.

Avoid Costly Mistakes. Hire an Expert in Tankless Water Heater Installation.

So how do we determine what size tankless hot water heater you need?

Simple. How many bathrooms you have, and the average amount of hot water on demand your household uses.

Should I get, Gas Tankless Hot Water Heater or Electric Tankless Hot Water Heater?

Although both Gas and Electric Tankless Water Heaters are much more efficient than traditional holding tanks, we recommend gas to our clients if possible. Gas Tankless Hot Water Heaters are more efficient and have a higher capacity than electric.

Some households may not have the ability to instal a Gas Tankless Hot Water Heater because you must have a dedicated gas line.

In that case, we can install an Electric Tankless Hot Water Heater and it’s still much more efficient than the traditional Hot Water Heater holding tank.

Reduce Your Energy Bill & Get Hot Water On Demand.

How does a Gas Tankless Hot Water Heater work?

Pretty simple actually. Natural gas is used to heat the heat exchanger (the fundamental part of every water heater), which then heats the water. From the moment you turn on your shower and the hot water reaches the shower-head it takes less than 10 seconds for the whole process. That’s why is called Hot Water On Demand.

French Connection Plumbing experts can advise you on the best Tankless Hot Water Heater for your household and help you understand your households hot water needs.

Schedule Your Installation Today!

How much water can a tankless water heater heat up, and by how many degrees?

Hot water is measured in Gallons Per Minute or GPM, your plumbing specialist will calculate your usage and determine the best size for your household.

To correctly size a tankless water heater, we make a rough estimation of your maximum hot water needs at any given point to ensure your Tankless Hot Water Heater is the best fit.

Did you know the highest hot water demand is from 9pm to 11pm?

That’s when we have the dishwasher running, taking showers/baths, brush our teeth, etc. Tankless hot water heaters can deliver anywhere from 2 GPM to 12 GPM of hot water.

This useful information table below shows how many GPM different water fixtures require in our households:


Gallons Per Minute (GPM)


​2.0 – 3.0 GPM

​Faucet (kitchen, bathroom)

​1.0 – 2.0 GPM


​1.5 – 2.0 GPM

​Washing Machine

​2.0 – 2.5 GPM

Information Table Source: Learn Metrics


Call French Connection Plumbing,

You'll Never Call Another Plumber!

(916) 833-7618


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