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Your Premier Online Plumbing Supplier Since 1995

Instantaneous Water Heaters - Electric

by Eemax

Proudly made in the USA

Tankless water heating is no longer a thing of the future: It is here today and here to stay!® is your source for tankless water heaters. Whether you need electric, propane, natural gas, point-of-use or whole house, you're sure to find just the system for your home or business needs at®.

Series Three Whole House Electric Tankless Water Heaters
Three Heating Elements

Eemax series 3 water heater
This whole house electric tankless water heater features:
  • Designed for whole house applications which has the capacity to handle up to two full baths and kitchen
  • On demand continuous hot water is possible with these units since there is no storage tank to deplete
  • Reduces installation costs and material by requiring only one cold water input, no solder connections, no T&P relief valve or no venting required
  • Sophisticated thermostat delivers precise outlet temperature
  • Regulates power to required flow (thermostatic control)
  • Comes with fitted 3/4" NPT water connections with thermal cut out
  • Unit mounts directly to the wall with common hardware
  • Reduces calcification and sedimentation
  • Single phase models
  • Compact size (15-1/4" x 12-1/4" x 4-1/4")

  • Turn on options:
    T2T - staged turn on with minimum .7 GPM, and the max flow is 4 GPM
    T3 - parallel turn on with minimum 1.8 GPM, and the max flow is 5 GPM

Eemax Tankless Water Heater - Three Heating Elements

Model # Volts kW Amps Recommended
Wire Size
Temperature Rise °F Price & Quantity
EX280 (T2T) 240V 28.5kW 120(3x40)A 8AWG 76° 65° 49° -- $1,059.71 Enter a quantity and
EX280 (T3) 240V 28.5kW 120(3x40)A 8AWG 76° 65° 49° 38° $1,078.84 Enter a quantity and

to replacement elements for Eemax tankless water heaters

Series Four Whole House Electric Tankless Water Heater
Four Heating Elements

Eemax series 4 water heater
This whole house electric tankless water heater features:
  • Unit is designed for whole house use with the capacity to handle up to three showers at a time with the four heating module design
  • Has the ability to provide up to 6 gpm of continuous bathing temperature water
  • Engineered to turn on in stages which uses only needed energy for amount of flow required
  • Sophisticated thermostat delivers precise outlet temperature
  • On demand hot water which cuts energy costs by helping to eliminate stand-by heat loss (99% efficiency rating)
  • Comes with fitted 3/4" NPT water connections with thermal cut out
  • Four glass-fiber reinforced heater bodies and a unique flow path that ensures optimum heat transfer and extended element life
  • Reduces calcification and sedimentation while also helping to prevent Legionella bacteria growth
  • All major component are field replaceable and readily available
  • Compact size (20-3/16" x 12-1/8" x 4-1/8")

  • Turn on options:
    T2T2 - staged turn on with minimum .7 GPM, and the max flow is 5 GPM
    T4 - parallel turn on with minimum 1.8 GPM, and the max flow is 8 GPM

Eemax Tankless Water Heater - Four Heating Elements

Model # Volts kW Amps Recommended
Wire Size
Temperature Rise °F Price & Quantity
EX380 (T2T2) 240V 38kW 160(4x40)A 8AWG + 86° 65° 52° 43° -- $0.00 Enter a quantity and
EX380 (T4) 240V 38kW 160(4x40)A 8AWG + 86° 65° 52° 43° 32° $0.00 Enter a quantity and

Accessories for Eemax Whole House Tankless Water Heaters

Wall Mount Drain Pan

Image Description Price & Quantity
Wall Saver for Tankless Water Heaters Drain Pan with PVC Adapter
  • Designed to help protect areas around the mounted heater from water damage.
6-pack of Drain Pans - includes PVC drain adapter $283.44 Enter a quantity and
PVC drain connector Replacement PVC Drain Connector
Includes 1 each: 1" PVC male adapter, gasket, and locknut
$5.57 Enter a quantity and

Order 6, 12, 24 or more drain pans for additional savings!
Order 2, 4 or more 6-Packs for additional savings!

Pricing discounts will show up in your shopping cart.

Ball Valves

Image Description Size Price & Quantity
3/4inch ball valve FIP Ball Valve   3/4" FIP $13.64 Enter a quantity and
3/4inch ball valve sweat Ball Valve   3/4" Sweat $13.65 Enter a quantity and
Stainless steel nipple adapter Stainless Steel Nipple Adapter 3/4" MIP x 1-1/2" Long $3.97 Enter a quantity and
 Order 10, 50, 100 or more of the same item for additional savings!
Pricing discounts will show up in your shopping cart.

Flexible Corrugated Water Flexes

Image Description Material Size Length Price & Quantity
Stainless steel water heater flexes Flexible Corrugated Water Flex Stainless Steel 3/4" FIP x 3/4" FIP 18" $7.44
3/4" FIP x 3/4" FIP 24" $8.27 Enter a quantity and
Copper / Stainless Steel 3/4" FIP x 3/4" Nominal Sweat 18" $7.61
3/4" FIP x 3/4" Nominal Sweat 24" $8.34 Enter a quantity and

Water Heater Scale Inhibitor System

image of complete scale inhibitor system
This scale inhibitor system features:
  • Highly effective in treating scale, corrosion and iron build-up for up to 6 months
  • Food-grade hexametaphosphate crystals dissolve slowly in water to prevent lime, scale and rust build-up
  • Forms a protective coating on all metal surfaces, safeguarding against acidity/alkalinity, hardness, chloride and other factors which effect the corrosion of water equipment and pipes
  • Maintains efficiently and extends life of system
  • Up to 5gpm
  • Recommended for use with water heaters, ice machines, vending machines, food service equipment, air conditioning and many other types of water processing applications
  • If using on a water heater, it needs to be installed on cold water line entering the water heater
  • Dimensions: 2 7/8" x 9 5/8"
  • Recommended time to change/replace this inhibitor cartridge is 4-6 months
  • It's a good idea to purchase a replacement cartridge to have on hand when needed!
  • For more information, go to our Scale Inhibitor Page

Description Price & Quantity
Scale Inhibitor System: includes housing, cartridge and mounting bracket $86.27 Enter a quantity and
Replacement Inhibitor Cartridge: Save on shipping by ordering replacement cartridge now! $57.26 Enter a quantity and
Mounting Bracket: included with Scale Inhibitor System $7.29 Enter a quantity and

FloodStop Systems for Water Heaters

  • Easily prevent water damage from a leaking water heater with this unique device
  • The unit automatically shuts off water supply to the water heater and sounds an alarm leaving all other household fixtures and appliances operational
  • Provides additional protection by requiring AA batteries to be inserted to protect in case of a power outage (batteries not included)
  • Controller will operate normally without batetries installed but will continue to beep until they are inserted
  • Can easily be installed in fifteen muinutes
  • Full-port motorized ball valve (brass)
  • 2014 Federal Safe Drinking Water Act compliant
FloodStop Components:
  • Motorized Full-Port Ball Valve (3/4 inch NPT pipe threaded)
  • New Style Control Unit (with Battery Backup 4 X AA Size)
  • Water/Leak Sensor (1-1/4" X 7-1/2")
  • AC Power Adaptor (or use 4 X AA Batteries as Primary Power Source)
  • Output Contact Wires (2)

Model # Description Price & Quantity
FS 3/4-NPT-V4 Water Heater FloodStop System - 3/4" Pipe Threaded
Works with any 3/4" MIPT supply line - rated 0-180 psi
$149.95 Enter a quantity and
FS 3/4-C-V4 Water Heater FloodStop System - 3/4" Compression
Works with any 3/4" copper applications - rated 0-180 psi
$166.49 Enter a quantity and

Make sure to follow all of the manufacturer's instructions and directions by performing the proper maintenance and inspections
to ensure that you are fully protected from flooding - this is ever-so-important with (man-made) safety devices as they will eventually fail.

Related Items & Information

Frequently Asked Questions

Q. "Why is the max flow lower for the staged turn on?"
A.The heating modules are set up differently to accommodate different flow rates.

Q. "What's the difference between the parallel turn on and the staged turn on?"
A. The parallel turn on will give you a higher maximum flow rate, and it needs a higher flow rate to turn on than the staged turn on. The staged turn on will turn on with a lower flow rate, and it handles a lower maximum flow rate than the parallel turn on.

Q. "How does the staged turn on work?"
A. Staged turn on models only use the heating modules needed to produce the desired output temperature.

Q. "Does the kW listed under each model represent the amount of energy they use if all the heating elements are on?"
A. Yes, the specification for kilowatt usage for all models show the maximum wattage with all heating elements on.

Q. "Is it possible to drain a tankless water heater to prevent freeze damage when not in use?"
A. Yes. Simply drain both lines 'to' and 'from' the unit. As long as there are no check valves in the way, that should drain the water from the unit. To guarantee that there is no water in the unit, we recommend two drain valves - one before and one after the unit - as well as blowing air through the water line.

Q. "If these units don't have a tank, how do they know when to turn on?"
A. The tankless water heaters have a flow switch built into them. When you turn on (open) the hot side of a faucet the water then moves (travels). Once the water is traveling at 3/4 of a gallon per minute or faster most tankless water heater switches will then turn on the gas or electricity. For this Eemax whole house model Ex280T2T, the turn on rate is .7 gallons per minute (GPM).

Q. "Can I replace my existing tank type water heater with a tankless water heater?"
A. Yes, but there are specific requirements that will need to be addressed. Gas units will require a larger, special vent pipe and a larger gas supply line that not only will supply the water heater, but all other appliances on that gas pipe run. Electric units will require larger gauge wire and breakers than most tank type water heaters.

Q. "There are many companies selling all kinds of tankless water heaters. Why should I buy an instantaneous electric water heater from you rather than elsewhere?"
A. We are a large, reputable company that was here yesterday and we will be here tomorrow. We are often copied, but we don't believe that any one can match our service and certainly our base of satisfied customers is larger than any Internet plumbing supplier since 1995. We sell 1000's of other quality plumbing products as well, so you can rest assured that we know plumbing products. We are a very stable and reputable company. We love to sell what we believe in, and we definitely believe in the quality of Eemax for their superior electric-tankless water heaters.

Q. "In the specifications for the Eemax Ex280T2T, you note the 'temperature rise' based on the GPM flow; what do you mean by this?"
A. Temperature rise is the amount the heater raises the temperature of the incoming water, based on the flow rate shown. In the specifications shown above for the EX280-T2T, there is a 65°F rise in temperature at a 3 gallons per minute (GPM) flow rate.

Q. "Will an instantaneous water heater save me money on my utility bills?"
A. In many applications you can see a savings. There are some variables that could reduce the amount you save. One example is you will not run out of hot water, so longer showers could cut into your savings. Also, the cost of electricity, propane and natural gas in your area will affect the amount of money saved. The higher the cost for the energy type used to heat your water, the quicker you can recover the higher initial cost of installing a tankless versus tank style water heater.

  • You will never run out of hot water. "You want an hour long shower? No problem!"
  • Electric units can be installed at the point of use.
  • You're not paying energy costs to heat water 24 hours a day.
  • They're easy to install.
  • Our electric units don't require a T&P valve (no tank!) - if code allows
  • Installing a tankless water heater can indeed be a bonus to the environment (why should we choose wastefulness when we're talking about finite natural resources?)
  • They all need a minimum flow rate & pressure to turn on.
  • The faster water flows through them, the lower the temperature rise. So, if you expect to take a shower while the clothes washer is running, you will need to select a unit sized to your maximum hot water flow requirements. (Gas units generally handle this a little better than electric models)
  • Electric units need heavy gauge wire. Example: the 9.5kw must have 8ga wire and a 50amp breaker.
  • Gas units need a much larger, special flue pipe and larger gas supply than a conventional water heater.
  • At times they can produce very hot water. It's easier to get scalded.
  • Gas units are more complicated than a conventional water heater.
  • With some brands, parts are hard to find - not a negative if you originally purchase from us, as we like to carry parts for the units that we sell

Tankless water heaters have their place. They're not "the answer" to every hot water need, but if they're used correctly they can be the solution to many of them.

Q. "I'm hearing a lot about lead-free these days. What does that have to do with plumbing products and how does the new lead-free legislation affect me?"
A. Basically, the laws implemented Jan. 1st, 2014 require plumbing products that come in contact with drinking water to be "essentially lead free" (less than 0.25% weighted average). For further information about how the law determines what is "lead free", rules regarding which plumbing products must be "lead free", and who these laws will affect, please click here.

Please note: While we strive to ensure every product we label as "Made in the USA" really is 100% made in the USA, it is also important to understand that sometimes manufacturers make changes to their products, or for various reasons may receive components or materials that they would normally purchase domestically from an overseas supplier - and they don't necessarily let distributors (like us!) know that they've changed something about the product or where it is manufactured.

If you receive a product that® says is "Made in the USA" and the product states it was manufactured elsewhere, please contact us. We will happily replace or refund your purchase to your satisfaction.

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