Waiwela WM-2.5: 2.5 Gallon Mini Tank Electric Water Heater


Weight: 21.00 lbs
MPN: WM-2.5

Rush Order:

2.5 gallon mini-tank water heater, perfect for point-of-use and garage applications.

Waiwela Mini Tank heaters combine quality materials with efficient manufacturing techniques to provide an affordable solution to a common problem. Every day, millions of gallons of fresh water is wasted waiting for hot water to reach the faucet or shower. Installing a Waiwela Mini tank heater under your sink eliminates the wait and reduces fresh water waste.

Waiwela WM-2.5: 2.5 Gallon Mini Tank Electric Water Heater

Application examples


• CFC free
• Glass-lined tank
• Floor or wall mount
• Attached 3' power cord with two-prong plug
• Install at point-of-use
• Under sink installation
• Available in 1, 2.5, 4 and 6 gallon capacities
• Adjustable thermostat with overheat protection
• Pressure release valve (T&P valve) can be replaced with any one that is rated for 150 psi, 210°F, 3/4" thread


  WM-1.0 WM-2.5 WM-4.0 WM-6.0
Capacity (gallons) 1.3 2.5 4 6
Temperature Range 50°F - 140°F
Voltage 120 VAC
Power at 120 VAC 1400 Watts
Water Pressure 150 PSI
Amperage 12 Amps
Phases 1
Recovery at 90°F Rise 6.5 GPH
Water Connection 1/2" NPT 3/4" NPT
Weight (empty) 12.5 lbs 20 lbs 24 lbs 26 lbs
Pressure Relief Valve Included
Width 11" 11.75" 11.75" 15.75"
Height (housing only
not including water connections)
12.5" 14.5" 19.25" 18"
Height (including PRV at top) 16" 18" 22.75" 21.5"
Depth including dial 10" 10.375" 10.375" 15.5"

** Example: The WM-2.5 has a 2.5 gallon capacity. At 6.5 gallons per hour, it will take 23 minutes for the tank to heat 2.5 gallons from 50°F to the unit's maximum temp of 140°F.


• Kitchen
• Restrooms
• Garage/workshop
• Maintenance closet
• Any under-the-sink application


• 2 Year warranty on parts
• 6 Year limited warranty on tank


User manual

Frequently Asked Question ("FAQ")

Q1: What are the temperature settings on the dial?
A1: The dial has four positions: Snowflake (*), 1, 2, 125°F, and Max.
≈ The Snowflake setting is 50°F. This setting will protect water in the tank and pipes inside the unit from freezing.
≈ The 1 setting is approximately 105°F, but can vary a few degrees.
≈ The 2 setting is approximately 113°F, but can vary a few degrees.
≈ The Max setting is 140°F.

Q2: How long will the hot water last until running out?
A2: The answer depends on a few factors:

• your incoming cold water temperature
• the tank temperature setting (which can be set from 60°F to 140°F)
• the flow rate of the point of use. For example, if you are using it with a kitchen sink, then the flow rate is typically 1.25 GPM. If bathroom sink, then the flow rate is typically 0.5 GPM, less than half of a kitchen sink, and makes a big difference.
• how much cold water you are mixing in to get your preferred output temperature

Let's assume that your incoming water temperature is 70°F, tank temperature setting is at the maximum 140°F, it is installed under a kitchen sink, and you are mixing cold water at the faucet to get a skin-comfortable output temperature of 105°F (not scalding hot 120°F for example). Given all that, then the hot water will last about 2.5 minutes.

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Average Customer Rating:

4 most useful customer reviews
Martha Cook
Jul 21, 2017
This customer purchased this item.
I have a tankless hot water heater at the back of my house. It took at least five minutes for me to get hot water to my kitchen sink for small jobs, and then I had to wait again if I needed hot water again. I couldn't wash a few things at a time in hot water while I was cooking. My new Waiwela 2.5 Mini Tank under my kitchen sink provides instant hot water until the tankless one provides hot water, and then the Waiwela turns off until needed again. I'm sorry it took me more than two years to discover this solution. It is wonderful! Also, the man I talked with at length at GadgetsGo was extremely knowledgeable, helpful, and patient with me as we talked through the problem I was having. He knew his products well and made excellent recommendations. Available space was an issue, and he even did extra research to find me the best unit that would fit in my space. I am a very happy customer!

Advantages: The Mini Tank fits under my sink (along with all the pipes and the food disposer) and provides hot water quickly until the tankless hot water heater kicks in to take over.

Disadvantages: I had to have another electrical outlet installed, but it was worth it!
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Sep 18, 2016
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Jul 15, 2016
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May 21, 2016
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