Comparing Efficiency: Gas vs Electric Tankless Water Heaters

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I personally prefer using smaller sized electrical tankless water heaters and placing them where they are needed. That means not having to wait for the hot water to travel from the other end of the house.

However, that problem could be solved by using a recirculating pump .

Also, smaller sized electric tankless water heaters may not require upgrading the electric service within the house.

Gas and electric tankless water heaters are famous for homeowners looking for energy-saving and financially savvy systems.

In this article, we will investigate the critical contrasts of gas vs electric tankless water heaters, zeroing in on efficiency and the job of temperature controllers.

Gas Tankless Water Heaters

Gas tankless water heaters depend on flammable gas or propane to warm water on request.

One of their prominent benefits is the quicker warming rate contrasted with their electric partners. The warming system starts the second you turn on the tap, giving an immediate amount of hot water.

This efficiency is especially favourable for extended families with simultaneous high-temperature water needs.

Temperature controllers assume a critical part in gas tankless water heaters, permitting clients to set and keep the ideal water temperature at all times. This prevents having to heat water to a higher temperature than need be, which saves money.

High-level temperature controllers in gas units frequently incorporate elements like computerised indicators and programmable settings, improving client control and accommodation.

Nonetheless, it’s crucial to note that gas tankless water heaters might cost more to begin with because of installation necessities. Such as the requirement for code compliant ventilation.

However, their efficiency and long-haul energy savings can provide lower monthly fuel bills compared to tank style water heaters.

Top Gas Tankless Water Heaters Compared

Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
Rinnai V53DeP Tankless Hot Water Heater, 5.3 GPM, Propane, Outdoor Installation
Rheem RRTGH95DVLN3701177 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Rinnai V53DeN Tankless Hot Water Heater, 5.3 GPM, Natural Gas, Outdoor Installation
Rinnai RL75IP Tankless Hot Water Heater, 7.5 GPM, Propane, Indoor Installation
Rinnai RSC199iN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 11 GPM, Indoor Installation, 199,000 BTU, Gray
Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
Rinnai V53DeP Tankless Hot Water Heater, 5.3 GPM, Propane, Outdoor Installation
Rheem RRTGH95DVLN3701177 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Rinnai V53DeN Tankless Hot Water Heater, 5.3 GPM, Natural Gas, Outdoor Installation
Rinnai RL75IP Tankless Hot Water Heater, 7.5 GPM, Propane, Indoor Installation
Rinnai RSC199iN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 11 GPM, Indoor Installation, 199,000 BTU, Gray
$1,384.11
$669.71
Price not available
Price not available
$1,005.75
$1,866.90
Natural Gas or Propane?
Natural Gas
Propane
Natural Gas
Natural Gas
Propane
Natural Gas
Indoor or Outdoor Installation?
Indoor
Outdoor
Indoor
Outdoor
Indoor
Indoor
Maximum Gallons Per Minute (GPM)
11
5.3
9.5
5.3
7.5
11
Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
$1,384.11
Natural Gas or Propane?
Natural Gas
Indoor or Outdoor Installation?
Indoor
Maximum Gallons Per Minute (GPM)
11
Rinnai V53DeP Tankless Hot Water Heater, 5.3 GPM, Propane, Outdoor Installation
Rinnai V53DeP Tankless Hot Water Heater, 5.3 GPM, Propane, Outdoor Installation
$669.71
Natural Gas or Propane?
Propane
Indoor or Outdoor Installation?
Outdoor
Maximum Gallons Per Minute (GPM)
5.3
Rheem RRTGH95DVLN3701177 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Rheem RRTGH95DVLN3701177 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Price not available
Natural Gas or Propane?
Natural Gas
Indoor or Outdoor Installation?
Indoor
Maximum Gallons Per Minute (GPM)
9.5
Rinnai V53DeN Tankless Hot Water Heater, 5.3 GPM, Natural Gas, Outdoor Installation
Rinnai V53DeN Tankless Hot Water Heater, 5.3 GPM, Natural Gas, Outdoor Installation
Price not available
Natural Gas or Propane?
Natural Gas
Indoor or Outdoor Installation?
Outdoor
Maximum Gallons Per Minute (GPM)
5.3
Rinnai RL75IP Tankless Hot Water Heater, 7.5 GPM, Propane, Indoor Installation
Rinnai RL75IP Tankless Hot Water Heater, 7.5 GPM, Propane, Indoor Installation
$1,005.75
Natural Gas or Propane?
Propane
Indoor or Outdoor Installation?
Indoor
Maximum Gallons Per Minute (GPM)
7.5
Rinnai RSC199iN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 11 GPM, Indoor Installation, 199,000 BTU, Gray
Rinnai RSC199iN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 11 GPM, Indoor Installation, 199,000 BTU, Gray
$1,866.90
Natural Gas or Propane?
Natural Gas
Indoor or Outdoor Installation?
Indoor
Maximum Gallons Per Minute (GPM)
11

Electric Tankless Water Heaters

Electric tankless water heaters, then again, utilise electrical components to warm water as it moves through the unit. For the most part, they have a lower upfront expense and more straightforward installation contrasted with gas units.

However, their water heating ability may not be as fast as gas powered tankless heaters.

Electric tankless water heaters cannot provide as much hot water volume as gas tankless water heaters. Which may require more than one tankless heater to provide instant hot water for multiple simultaneous uses.

The solution is to have smaller units at each location of water use. This also reduces the need for upgraded electrical wiring that larger tankless heaters require. The net result can be a lower overall installation cost.

Temperature controllers are similarly significant in electric tankless water heaters, guaranteeing clients can set and keep the ideal water temperature. Temperature control accuracy increases energy efficiency, as clients can avoid pointless warming and forestall energy squandering.

Top Electric Tankless Water Heaters Compared

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
Rheem 11kW 240V Tankless Electric Water Heater
Electric Tankless Water Heater, ECOTOUCH 14kW Instant Hot Water Heater on Demand 240V Point of Use Hot Water Heater Self-Modulation ECO140B Black
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
Rheem 11kW 240V Tankless Electric Water Heater
Electric Tankless Water Heater, ECOTOUCH 14kW Instant Hot Water Heater on Demand 240V Point of Use Hot Water Heater Self-Modulation ECO140B Black
$192.62
$399.00
$576.00
$846.62
$269.00
$219.99
Maximum Gallons Per Minute (GPM)
3.1
8.7
5.9
7.5
2.68
3.2
Kilowatts (KW)
13
36
24
36
11.8
14
Voltage
240
240
240
240
240
240
Maximum Amperage
57
150
200
150
46
58
Required Amperage. Double Pole Breaker
1 x 60 AMP DP
4 x 40 AMP
(3 x 40) AMP
3 x 50 A DP
(1 x 60) AMP
1X60AMP Double Pole Breaker
American Wire Gauge (AWG)
1 x 6 AWG
4 x 8 AWG
8
3 x 6/2 AWG
6
1X6AWG/2 wires
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
$192.62
Maximum Gallons Per Minute (GPM)
3.1
Kilowatts (KW)
13
Voltage
240
Maximum Amperage
57
Required Amperage. Double Pole Breaker
1 x 60 AMP DP
American Wire Gauge (AWG)
1 x 6 AWG
Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
$399.00
Maximum Gallons Per Minute (GPM)
8.7
Kilowatts (KW)
36
Voltage
240
Maximum Amperage
150
Required Amperage. Double Pole Breaker
4 x 40 AMP
American Wire Gauge (AWG)
4 x 8 AWG
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
$576.00
Maximum Gallons Per Minute (GPM)
5.9
Kilowatts (KW)
24
Voltage
240
Maximum Amperage
200
Required Amperage. Double Pole Breaker
(3 x 40) AMP
American Wire Gauge (AWG)
8
Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
$846.62
Maximum Gallons Per Minute (GPM)
7.5
Kilowatts (KW)
36
Voltage
240
Maximum Amperage
150
Required Amperage. Double Pole Breaker
3 x 50 A DP
American Wire Gauge (AWG)
3 x 6/2 AWG
Rheem 11kW 240V Tankless Electric Water Heater
Rheem 11kW 240V Tankless Electric Water Heater
$269.00
Maximum Gallons Per Minute (GPM)
2.68
Kilowatts (KW)
11.8
Voltage
240
Maximum Amperage
46
Required Amperage. Double Pole Breaker
(1 x 60) AMP
American Wire Gauge (AWG)
6
Electric Tankless Water Heater, ECOTOUCH 14kW Instant Hot Water Heater on Demand 240V Point of Use Hot Water Heater Self-Modulation ECO140B Black
Electric Tankless Water Heater, ECOTOUCH 14kW Instant Hot Water Heater on Demand 240V Point of Use Hot Water Heater Self-Modulation ECO140B Black
$219.99
Maximum Gallons Per Minute (GPM)
3.2
Kilowatts (KW)
14
Voltage
240
Maximum Amperage
58
Required Amperage. Double Pole Breaker
1X60AMP Double Pole Breaker
American Wire Gauge (AWG)
1X6AWG/2 wires

Energy Source and Efficiency

Gas and electric tankless water heaters differ in their energy sources. Gas models utilize natural gas or propane, while electric ones rely solely on electricity.

Despite this difference, both types offer greater efficiency than conventional water heaters, which constantly heat stored water, resulting in higher energy consumption.

Efficiency Ratings

Electric tankless water heaters typically boast a UEF (Uniform Energy Factor) rating of .96 or higher, indicating superior energy efficiency. On the other hand, gas tankless water heaters have a UEF rating ranging between .81 to .96, slightly lower than their electric counterparts.

Although both types deliver significant energy savings compared to traditional water heaters, electric models often exhibit slightly higher efficiency.

Additionally, electricity is regarded as a more environmentally friendly option due to its lower greenhouse gas emissions than the combustion process associated with gas heating.

Cost Comparison

The cost disparity between gas and electric tankless water heaters encompasses various factors, including initial purchase price, installation complexity, and ongoing operational expenses.

Initial Costs

Electric tankless water heaters generally cost less to purchase, typically ranging from $200 to $700 without installation.

In contrast, gas tankless water heaters tend to have higher initial purchase prices, ranging from $300 to $2,000 without installation.

The discrepancy in initial costs can be attributed partly to the manufacturing complexity of gas tankless water heaters, which require gas lines and proper ventilation.

However, it is essential to consider long-term operational costs, such as electricity and gas rates, which can influence overall savings.

Operational Expenses

Account for monthly operational expenses, including energy bills and maintenance costs. While electric heaters may entail lower maintenance expenses, electricity rates vary by location and may impact overall expenditures.

Gas heaters, conversely, may necessitate more frequent maintenance but could prove to be more cost-effective in regions with lower gas prices. 

Hot Water Production

The ability to provide hot water on demand is a critical consideration when comparing gas and electric tankless water heaters. Which brings us to flow rates.

Flow Rates

Gas tankless water heaters typically offer higher flow rates, ranging from 3.5 to 11 gallons per minute (GPM). In comparison, electric tankless water heaters generally exhibit lower flow rates, typically between 1 to 7 GPM.

Gas heaters excel in delivering a continuous and ample supply of hot water, making them well-suited for households with high hot water demand. Conversely, electric models may struggle to meet the simultaneous demands of multiple significant appliances due to their lower flow rates.

Temperature Controller

Both gas and electric tankless water heaters are equipped with temperature controllers to regulate water temperature efficiently. These controllers ensure consistent and precise hot water delivery while optimizing energy usage.

Gas vs Electric Tankless Water Heaters
When choosing between Gas vs Electric Tankless Wate Heaters, add up the purchase price and the installation price.

Other Considerations When Choosing Gas vs Electric Tankless Water Heaters

Factors such as installation complexity, maintenance requirements, and environmental impact should also be considered.

Installation Complexity

Gas tankless water heaters require additional infrastructure for gas supply lines and venting, making installation more complex and potentially costlier. Whereas electric tankless heaters do not require venting.

Maintenance

Gas tankless water heaters generally need more maintenance than electric ones, which can result in additional costs over time.

Environmental Impact

While gas heaters may offer higher efficiency, consider the environmental impact of gas emissions. Electric heaters produce fewer emissions and might be a more environmentally friendly option.

Point Of Use Tankless Water Heaters

These 110-120 volt tankless heaters are only useable for one sink or one shower because of their low flow rates.

Flow rates for these heaters are often times too low to be used for showers except in very warm climates.

Read my article: 9 Best Performing 120-110 Volt Tankless Water Heater Reviews

Conclusions On Gas vs Electric Tankless Water Heaters

While choosing gas and electric tankless water heaters, it is critical to consider factors like efficiency, cost, high-temperature water production, maintenance requirements, and environmental impact.

Gas models ordinarily offer higher flow rates and efficiency, while electric ones frequently have lower upfront expenses and might be all the more environmentally agreeable.

At last, the decision relies upon individual inclinations, family temp water interest, financial plan contemplations, and long-haul sustainability goals. By cautiously gauging these variables, homeowners can go with an educated choice to guarantee a proficient and dependable heated water supply for their homes.

Last update on 2024-04-04 / Affiliate links / Images from Amazon Product Advertising API

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