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Buyer's guideTypes of water heaters: tank, tankless, heat pump and more
Your water heater quietly runs every shower, load of laundry and sink full of dishes — and the type you choose affects your energy bills, hot-water supply and upfront cost. Here are the main water heater types and how to choose.
Key takeaways- Storage tank heaters are cheapest upfront; tankless cost more but save space and energy and never run out.
- Heat-pump (hybrid) heaters are the most energy-efficient electric option and can cut water-heating bills significantly.
- Sizing matters — too small and you run out of hot water; too big and you waste energy.
- Water heater installation (especially gas or electrical upgrades) should go to a licensed pro.
What to consider before you choose
Fuel type
Gas, electric and hybrid each have different running costs and install needs. Switching fuel types adds cost (new gas line or electrical capacity).
Capacity and demand
Tank heaters are sized by gallons for your household; tankless by flow rate. Undersizing means cold showers; oversizing wastes energy.
Efficiency and running cost
A cheaper unit can cost more over its life if it's inefficient. Weigh upfront price against years of energy bills — this is where tankless and heat-pump models shine.
Space and venting
Tankless and wall-mounted units free up floor space; gas models need proper venting. Your space can rule some options in or out.
The main water heater types, compared
1. Storage tank water heater
The traditional unit that heats and stores a tank of hot water, ready to use. Available in gas or electric.
| Pros | Cons |
|---|
- Low upfront cost
- Simple, familiar
- Easy to repair
|
- Runs out during heavy use
- Standby energy loss
- Takes floor space
|
Best for: Budget-focused homes with steady demand
2. Tankless (on-demand) water heater
Heats water instantly as it flows, so you never run out — and there's no standby loss.
| Pros | Cons |
|---|
- Endless hot water
- Energy-efficient
- Space-saving
- Long lifespan
|
- Higher upfront cost
- Flow-rate limits
- May need upgrades to install
|
Best for: Homes wanting efficiency and no cold showers
3. Heat-pump (hybrid) water heater
Moves heat from the air to warm water, using far less electricity than a standard electric tank.
| Pros | Cons |
|---|
- Most efficient electric option
- Big energy savings
- May qualify for rebates
|
- Higher upfront cost
- Needs space and airflow
- Works best in warmer areas
|
Best for: Efficiency-focused electric homes
4. Condensing water heater
A high-efficiency gas unit that captures heat from exhaust gases, often with a tank.
| Pros | Cons |
|---|
- Very efficient for gas
- Good for high demand
|
- Higher cost
- More complex venting
|
Best for: High-demand homes on gas
5. Point-of-use water heater
A small unit installed near a specific fixture for instant hot water where the main heater is far away.
| Pros | Cons |
|---|
- Instant hot water at the tap
- No long waits
- Low cost per unit
|
- Only serves one area
- Not a whole-home solution
|
Best for: Far-off bathrooms or additions
Book plumbing on Genie
Found the type you want? Book a vetted, insured pro at an upfront price:
FAQ
Is a tankless water heater worth it?
Often yes — endless hot water, lower energy use and a long lifespan offset the higher upfront cost over time, especially for efficiency-minded homes.
What's the most energy-efficient water heater?
A heat-pump (hybrid) electric unit is the most efficient for most homes and can meaningfully cut water-heating bills, sometimes with rebates.
Can I install a water heater myself?
It's not recommended — gas, venting and electrical requirements make it a licensed-pro job. On Genie you can book a licensed plumber or HVAC pro at a quoted price.
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