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 home. 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. Shop online Securely.

136-150 of 193 products Sort by 

Eemax PA007240T

Eemax PA007240T

Eemax Tankless Water Heater, 240V 27A Electric Whole House ProAdvantage Series - Indoor, 2.5 GPM

Our Price: $454.88
+ FREE Shipping
Qty

Eemax PA005240T

Eemax PA005240T

Eemax Tankless Water Heater, 240V 20A Electric Whole House ProAdvantage Series - Indoor, 2.5 GPM

Our Price: $452.23
+ FREE Shipping
Qty

Bosch Tronic 3000 US6

Bosch Tronic 3000 US6

Bosch Tankless Water Heater, 277V 25A Electric Electric Point-of-Use (Powerstream Pro RP2P) - Indoor

Our Price: $191.00
as low as: $177.63

Bundle Items & SAVE!

Add 3 : $183.36 ea. (4% off)
4+ : $177.63 ea. (7% off)
+ FREE Shipping
Qty

Rheem RTG20236A

Rheem RTG20236A

Rheem Tankless Water Heater Natural Gas Commercial Conversion Program Chip for RTG-95DVN

Regular Price: $32.38
On Sale: $26.98
as low as: $25.09

Bundle Items & SAVE!

Add 15 : $25.90 ea. (4% off)
28+ : $25.09 ea. (7% off)
Qty

Wiseman EFSM1LT

Wiseman EFSM1LT

Wiseman Everfree Drain Opener and Descaler, Small 1 Liter

Our Price: $11.55
Qualifies for Pallet Pricing!

Purchase Pallet Items & Save!

Order $2000 in Pallet Items and
Save an Extra 5% off your Pallet!

Qty

Rheem RTG-20149C

Rheem RTG-20149C

Rheem Tankless Water Heater 3" Single 90 Degree Elbow for Wall Venting

Regular Price: $51.99
On Sale: $36.50
as low as: $33.95

Bundle Items & SAVE!

Add 11 : $35.04 ea. (4% off)
20+ : $33.95 ea. (7% off)
Qty

Rheem RTG20006DN-1

Rheem RTG20006DN-1

Rheem Tankless Water Heater High Altitude Chip for RTG-74PVN - Natural Gas (6561-9840 Ft.)

Regular Price: $27.99
On Sale: $19.95
Qualifies for Pallet Pricing!

Purchase Pallet Items & Save!

Order $2000 in Pallet Items and
Save an Extra 5% off your Pallet!

Qty

Rheem RTG20006DL-1

Rheem RTG20006DL-1

Rheem Tankless Water Heater High Altitude Chip for RTG-74PVP - Liquid Propane (6561-9840 Ft.)

Our Price: $26.99
as low as: $25.10

Bundle Items & SAVE!

Add 15 : $25.91 ea. (4% off)
28+ : $25.10 ea. (7% off)
Qty

Rheem RTG20060

Rheem RTG20060

Rheem Tankless Water Heater Direct Vent Sweet Termination Kit - 13" to 17" Wall Thickness

Regular Price: $300.99
On Sale: $214.99
Qualifies for Pallet Pricing!

Purchase Pallet Items & Save!

Order $2000 in Pallet Items and
Save an Extra 5% off your Pallet!

+ FREE Shipping
Qty

Noritz VK4-H-8-1

Noritz VK4-H-8-1

Noritz Stainless Steel 4" Diameter Venting Horizontal Termination Kit, 4.1"-7.4" Wall Thickness - For NR71, NR98, NR111, NR199, NC250 & NH Series

Our Price: $174.99
as low as: $162.74

Bundle Items & SAVE!

Add 3 : $167.99 ea. (4% off)
5+ : $162.74 ea. (7% off)
+ FREE Shipping
Qty

Noritz VT4-SH

Noritz VT4-SH

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

Our Price: $84.99
Qualifies for Pallet Pricing!

Purchase Pallet Items & Save!

Order $2000 in Pallet Items and
Save an Extra 5% off your Pallet!

Qty

Noritz HBC-1

Noritz HBC-1

Noritz Tankless Water Heater Scale Shield Replacement Cartridge

Our Price: $84.99
Qualifies for Pallet Pricing!

Purchase Pallet Items & Save!

Order $2000 in Pallet Items and
Save an Extra 5% off your Pallet!

Qty

Noritz VC-4-1

Noritz VC-4-1

Noritz Stainless Steel 4" Diameter Venting Outdoor Vent Cap, For NR71, NR98, NR111, NR199, NC250 & NH Series

Our Price: $67.99
Qualifies for Pallet Pricing!

Purchase Pallet Items & Save!

Order $2000 in Pallet Items and
Save an Extra 5% off your Pallet!

Qty

Noritz VC-132

Noritz VC-132

Noritz Stainless Steel 5" Diameter Venting Outdoor Vent Cap, For NC380 Series Water Heaters

Our Price: $115.20
as low as: $107.14

Bundle Items & SAVE!

Add 4 : $110.59 ea. (4% off)
7+ : $107.14 ea. (7% off)
+ FREE Shipping
Qty

Noritz VP4-36STRAIGHT

Noritz VP4-36STRAIGHT

Noritz Stainless Steel 4" Diameter Venting Rigid Straight Vent Pipe, 36" Length - For NR71, NR98, NR111, NR199, NC250 & NH Series

Regular Price: $53.99
On Sale: $38.40
as low as: $35.71

Bundle Items & SAVE!

Add 11 : $36.86 ea. (4% off)
19+ : $35.71 ea. (7% off)
Qty
136-150 of 193 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.