Tankless Water Heaters

Tankless water heaters provide continuous and uninterrupted hot water for multiple household demands at the same time. A tankless water heater comes available in electric or gas configurations suited to your exact needs and specifications.

According to the EPA, water heating ranks as the 3rd largest household energy expense and may reach as much as 25% of the energy consumed in your household. Depending on usage, a household could save up to $384 yearly by using a tankless water heater,

Tankless Water Heater Benefits:

  • Energy savings
  • Convenience
  • Increased Space
  • Reliability

Westside Wholesale caries the finest names in residential tankless water heaters from Rheem Tankless, Bosch, Eemaz, Norritz, Stiebel Eltron, and Wiseman. Browse ankless water heater prices, read reviews, and order online securely. Maxmize savings with our buyer rewards program. The Rheem Tankless Water Heater and Bosch Tankless Water Heater lines are some of the most popular.

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Noritz WT5

Noritz WT5

Noritz Stainless Steel 5" Diameter Venting Horizontal Wall Thimble, For NC380 Series

Our Price: $56.75
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Stiebel Eltron 540002

Stiebel Eltron 540002

Stiebel Eltron Tankless Water Heater Flow-Aide Fluid Descaler Refill - 1 Quart

Our Price: $27.99
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Rheem RTG20214C

Rheem RTG20214C

Rheem Tankless Water Heater Commercial Conversion Kit for RTG-95XN

Our Price: $25.99
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Noritz VP4-48STRAIGHT

Noritz VP4-48STRAIGHT

Noritz Stainless Steel 4" Diameter Venting Rigid Straight Vent Pipe, 48" Length - For NR71, NR98, NR111, NR199, NC250 & NH Series

Our Price: $46.28
as low as: $43.04

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Bosch 7709003775

Bosch 7709003775

Bosch Tankless Water Heater Indoor Freeze Protection Kit for 330 PN, 520 HM, & 520 PN

Our Price: $53.99
as low as: $50.21

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Rheem RTG20216A

Rheem RTG20216A

Rheem Tankless Water Heater Commercial Conversion Kit for RTG-84DVN

Our Price: $25.99
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Noritz VP5-90ELBOW

Noritz VP5-90ELBOW

Noritz Stainless Steel 5" Diameter Venting 90 Degree Elbow, For NC380 Series

Our Price: $44.98
as low as: $41.83

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Add 9 : $43.18 ea. (4% off)
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Rheem RTG20000AJ

Rheem RTG20000AJ

Rheem Tankless Water Heater High Altitude Chip for RTG42 - Liquid Propane (3281-6560 Ft.)

Our Price: $9.50
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Noritz FS4

Noritz FS4

Noritz Stainless Steel 4" Diameter Venting Vertical Fire Stop, For NR71, NR98, NR111, NR199, NC250 & NH Series

Our Price: $17.34
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Rheem MIC-K-32

Rheem MIC-K-32

Rheem Tankless Water Heater 32 Ft. Communication Cable

Our Price: $31.96
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Noritz SV-CK-3

Noritz SV-CK-3

Noritz Direct Vent to Single Vent PVC Venting Conversion Kit, For NRC83, NRC09, NRC1111 & NCC1991 Series

Our Price: $11.94
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Noritz VP4-ADAPT-1

Noritz VP4-ADAPT-1

Noritz Stainless Steel 4" Diameter Venting Appliance Adapter, For NR71, NR98, NR111, NR199, NC250 & NH Series

Our Price: $22.01
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Noritz VP4-12STRAIGHT

Noritz VP4-12STRAIGHT

Noritz Stainless Steel 4" Diameter Venting Rigid Straight Vent Pipe, 12" Length - For NR71, NR98, NR111, NR199, NC250 & NH Series

Our Price: $13.20
as low as: $12.28

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Noritz DT5

Noritz DT5

Noritz Stainless Steel 5" Diameter Venting Horizontal Drain Tee, For NC380 Series Water Heaters

Our Price: $19.03
as low as: $17.70

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Noritz QC-2

Noritz QC-2

Noritz Tankless Water Heater Quick Connect Cord, For Models NRC98-DV and NR83-DVC

Our Price: $17.94
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166-180 of 223 products Sort by 

How to Select

How to Select a Tankless Water Heater

The most important factor when deciding which tankless water heater to purchase is based on the number of fixtures you need to get heated water to and the amount of water to heat. It is not uncommon for a homeowner to purchase the tankless unit that seems correct for their application to find that they miscalculated. We always recommend purchasing a tankless unit with redundancy in output; therefore you will never have an issue with lack of hot water.  Most ratings from the manufacturer do not take into account your unique plumbing situation, so consulting a professional is recommended.

Tankless Water Heater Considerations:

  1. Power Type: Electrical, Natural Gas, Liquid Propane. Depending on your house utility configuration, you can connect a tankless unit to any of the following power sources, however, you must consider that an electrical tankless unit will not work in Natural gas applications or Propane, and vice versa.
  2. For Electric Tankless Heating Units, your amperage and voltage are very important. Your breaker size may be too small, or may need to be upgraded to accommodate the new heater. If this is the case, upgrade to a breaker that will have some redundancy in power rating.
    (For example, if your tankless heating unit requires a 40 Amp breaker, we recommend installing a 50 Amp just in case.)
  3. How far your tankless heating unit will be installed from your fixtures. If your heater is too far from your shower, or faucets, they will either get a reduced flow of water, or a lack of heat. This is caused by the added traveling distance the water must travel through your pipes.  If this is a concern for you, consult our staff for expert advice, or consult the installer for recommendations.
  4. Whole house or Point of Use. Point of use tankless units only operates with a single fixture at the point of use. Some point of use models can work with extension kits to expand usage to multiple fixtures. Whereas whole house tankless units are designed for larger volumes and will provide heated water to all fixtures in your household. Once again, it is important to take redundancy into account with Whole house heaters to make sure each fixture has steady, warm flow.

For additional assistance, or for expert advice, contact our Customer Service Department through Live Chat or by telephoning 1 (877) 998-9378.