Tank-less Water Heater versus Tank Water Heater



tank water heater

Diagram of Tank Water Heater

Waking up in the morning for early work during winter months is an unbearable task if you stumble upon a bucket of water that is icy cold and doesn’t have a water heater installed in. But with water heaters, bathing becomes more comfortable as the heating device makes lukewarm water. it’s useful for cooking, space heating, washing dishes, and cutleries. Investing in one is a great way to modernize and expand your household HVAC system. Before buying water heaters, it’s good to know the commonly used water heaters – tank and tankless water heaters as detailed below:




Tankless Water Heater

This water heater has just a box-like unit that includes all mechanism that turns tap water hot. Inside, the box unit, you can find a heat exchanger, a burner or heating element, inlet and outlet sensors, valve, thermostats, piping, fan and electronic circuitry that controls heating and the fan.

How does it Work?

When you turn on the faucet, the water enters the heater and upon entering the heater, the electronic inlet sensor activates the burner which heats up the heat exchanger. Electric powered water heaters have no burner but instead, has the heating element that heats up with electricity. The pipe in which the water runs through gets hot thereby heating the water as well. When the water goes out of the outlet, it emerges hot and ready for use.


  • Small, tank-less water heater saves up space and is less bulky.
  • Most models are a size of a suitcase.
  • Low maintenance cost for long-term usage.
  • Lasts longer
  • No tank means no flooding and no rupture
  • More Energy efficient


  • The expensive upfront cost which is over $1000. That includes sealed venting system for gas type heaters, electrical and gas line installation.
  • Needs minimum flow to heat up heat exchanger. During the heating up process, some water is wasted.
  • Serves one faucet at a time which means just one hot water for one shower.

Tank type Water Heater

By its name, tank water heater has a tank to store water for heating. Its cylinder like the unit has cold water valve inlet, hot water valve out, vent connector, thermostat control, pilot light, drip leg, gas pipe, and burner.

How does it Work?

When cold water goes in, it activates the cold water in the sensor. The unit draws hot water from the bottom heated by the burner and passes it through the hot water valve outlet. If the water gets cold, the unit sensor detects the temp and starts again the burner or heater.


  • Low Initial upfront installation and unit cost
  • Can supply multiple users which means one can shower and at the same time the other can use a dishwasher machine.
  • Available as an Energy star certified product



  • Additional maintenance cost in the long-term
  • Retrofitting can be costly and difficult
  • Tank calcium deposit build up
  • Heat loss on standby
  • Less durable – 10 to 15 years
  • Risks of flooding due to rupture
  • Requires more space due to its tank


Hybrid Water Heater

Combines Tank and Tankless water heater. This type has the efficiency, pros, and cons of tankless and tank type water heater. With hybrid water heater, you’ll get a tank reservoir while having the efficiency of the suitcase size water heater unit. You can find one example of water heater such as featured by Rheem, an American water heater maker. Further, some manufacturers plan to combine super capacitors, solar energy and chemical cell technology to make such super-efficient water heater.


In Conclusion

If you are low in budget, then a tank type water heater is the best but if you have an extra, you can invest in the tankless water heater and reap the rewards of long- term savings and energy efficiency. Or, you can choose Hybrid Water Heater that combines the two earlier types. It depends upon your needs, situation, and budget.

Need quality and affordable maintenance, repair and installation for your Air conditioner, furnace, water heater and heat pumps? Look no beyond AS Heating and Cooling. We are the team of passionate HVAC professionals ready to provide answers to your HVAC woes. We are just call away at 416 803 8053 or visit us at our site http://www.asheatingcooling.ca/ or info@asheatingcooling.com

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