Demand Water Heater
A demand water heater (tankless) heats water only when needed, eliminating standby losses from a storage tank. Water flows through a heat exchanger and is warmed instantly, providing continuous hot water as long as flow rates stay within the unit’s capacity.
💡 Key Takeaways
- ✓A demand water heater (tankless) heats water only when needed, eliminating standby losses from a storage tank. Water flows through a heat exchanger and is warmed instantly, providing continuous hot water as long as flow rates stay within the unit’s capacity.
- ✓Upfront cost is higher, but operating costs are often lower.
- ✓Hard water areas need periodic descaling to maintain efficiency.
- ✓Flow rate limits mean simultaneous uses can reduce temperature.
Demand Water Heater
/dɪˈmænd ˈwɔːtər ˈhiːtər/
Definition
A demand water heater (tankless) heats water only when needed, eliminating standby losses from a storage tank. Water flows through a heat exchanger and is warmed instantly, providing continuous hot water as long as flow rates stay within the unit’s capacity.
What is a demand water heater?
It is a tankless system that heats water only when you turn on a tap, reducing energy waste.
Source: The Cooling Company
Quick Facts
How Demand Water Heater Works
Tankless units heat water on demand to reduce standby loss.
Real-World Application
A family replaces a storage tank with a gas tankless unit to get endless hot showers and lower energy bills.
Pro Tip
Size the unit for peak flow demand and consider professional installation for venting and gas line requirements.
“Size the unit for peak flow demand and consider professional installation for venting and gas line requirements.”
Important Things to Keep in Mind
- Upfront cost is higher, but operating costs are often lower.
- Hard water areas need periodic descaling to maintain efficiency.
- Flow rate limits mean simultaneous uses can reduce temperature.
Did You Know?
Tankless water heaters have been around since the early 1900s, but modern designs are far more efficient.
FAQ
Do tankless water heaters provide endless hot water?
Yes, as long as the flow rate stays within the unit’s capacity.
Do tankless units work in cold climates?
Yes, but colder inlet water reduces flow capacity, so sizing matters.
How often should a tankless heater be serviced?
At least annually, with descaling in hard‑water areas.
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