Rheem EcoSense 8.4 GPM 180,000 BTU Mid Efficiency Liquid Propane Gas Indoor Tankless Water Heater-DISCONTINUED-ECO-180XP at The Home Depot

Rheem EcoSense

Model # ECO-180XP

Internet # 100658418

8.4 GPM 180,000 BTU Mid Efficiency Liquid Propane Gas Indoor Tankless Water Heater-DISCONTINUED

Rheem EcoSense 8.4 GPM 180,000 BTU Mid Efficiency Liquid Propane Gas Indoor Tankless Water Heater-DISCONTINUED

This item has been discontinued.
The Home Depot no longer carries this specific product.

$1,032.00 / each


In Stock



Model # ECO-180XP

Internet # 100658418

Store SO SKU # 429868

The Rheem EcoSense 8.4 GPM 180,000 BTU Tankless Gas Water Heater is designed for outdoor installation and has a compact size that saves you valuable floor space. Fueled by liquefied propane gas, the heater easily provides enough water to help you run 1 or 2 hot water appliances at the same time. Precise temperature control is a breeze thanks to the heater's remote-controlled digital thermostat, which can be placed anywhere in your house.

  • Provides continuous hot water at 8.4 GPM, helping you run 1 or 2 hot water appliances at the same time
  • Uses liquefied propane gas to effectively heat water
  • 5-year warranty on the parts, plus a 1-year labor warranty for your convenience
  • Energy factor of 0.82 exceeds the requirements of most utility rebate programs
  • Energy-efficient design saves you up to 30% on fuel costs compared to a standard gas water heater or up to 70% compared to a standard electric water heater
  • Energy star qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings
  • Delivers 180,000 BTUs
  • Uniquely designed for outdoor installations
  • Compact-sized heater saves valuable floor space and eliminates venting costs
  • Remote-control digital thermostat can be placed anywhere in the house for convenience and provides precise temperature control

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.


Assembled Depth (in.)  8.875 in  Assembled Height (in.)  23.625 in 
Assembled Width (in.)  13.875 in  Automatic Shut-off  No 
Certifications and Listings  CSA Listed  ENERGY STAR Certified  Yes 
Finish Family  Gray  Flow Rate @ 35 F Rise (gallons/min)  8.4 gal (US)/min 
Flow Rate @ 45 F Rise (gallons/min)  6.6 gal (US)/min  Fuel Type  Gas 
Gas Connection Size  3/4"  Gas Product Type  Commercial & Residential 
Gas Type  Liquid Propane  Gas Type  Liquid Propane 
Indoor/Outdoor  Outdoor  Labor Warranty  1 Year 
Maximum Temperature (F)  140  Minimum Activation Rate (gpm)  .40 
Minimum Temperature (F)  85 °F  Part Warranty  5 Year 
Pilot Light  No  Point-Of-Use  No 
Product Depth (in.)  8.875  Product Height (in.)  23.625 
Product Weight (lb.)  54 lb  Product Width (in.)  13.875 
Residential/Commercial/industrial Use  Residential or commercial  Returnable  90-Day 
Total BTU  180000 Btu  Vent diameter (in.) 
Water Connection Location  Bottom  Water Connection Size (in.)  3/4" 


Rated 3.9 out of 5 by 7 reviewers.
Rated 5 out of 5 by Loving every minute of it! Because I switched from a conventional water heater with a standing pilot, this was a bit more of a project than I had planned on. If this describes you, consider that you must use a venting system rated for this appliance, it will require a 3/4" gas supply, and will also require a nearby outlet (preferable GFCI). My install went nicely, and the work required to install the venting, larger gas piping, and outlet...along with a fairly substantial change in my water piping, was well rewarded! I LOVE this water heater, it's nearly silent, and the heated water output is amazingly instant. As I shopped, I considered buying the outdoor mounted unit. I thought the savings from burning outdoor air would add value. Since the only one I could get locally was an indoor unit, I was VERY glad that was the one I got. The combustion air comes from outdoors anyway through the concentric vent system, and now if we have intense cold, my water pipes are safely in my basement where they will not freeze. Knowing that, I cannot think of a single good reason to install the unit outdoors. Some things to consider about your home before using a tankless water heater. First, if you don't have a 3/4 or larger gas main to your house...forget this product. Secondly, if you have low water flow, either from 1/2" piping, or from low pressure, this may not be for you. I researched several hours before making my purchase, and saw several people complaining about issues where the unit would run intermittantly, low gas pressure, or low water flow will absolutly cause this. The remedy for low water flow is simple, add a booster pump and tank, then you will have the flow you need to start the unit. If you have a small gas main, and insist on having one of these, I'd contact your utlity before installation, to make sure they can provide larger supply if needed. For the rest of us...most homes will have ample gas supply and water flow to make this work without problems. Keep in mind that the nature of this appliance is that it heats water on demand, rather than storing it....that's cool beacuse it saves the energy we used to waste keeping a tank hot...but since it requires a minimun flow to allow the burner to run, drawing hot water at a trickle simply will not work. I don't use hot water that way, but if you do, now you know. As I'm writing this, it is day one of operation, my wife has been in the shower for 20 minutes. :) I'm guessing it may be another half hour before she has tired of the endless stream of steady tempered water. Some of the savings in energy might not be realized at our home for a while, as we bask in the enjoyment of hot showers that don't end with luke warm water! (Then we'll get a gas bill and return to reality) If your home has a circulating system to keep the pipes warm....the flow rate of the circulating pump probably won't be enough to turn on the tankless heater. If you MUST have preheated pipes, you may want to add a small water heater, something like the kind used in an RV, just for that purpose. Last thought, my wife just got out of the shower and said "That's wierd, the water temperatuer never changed, I'm so used to fiddeling with the fawcet all during the shower to keep the temperature I like." Well...that settles it for me, if she loves it, I double love it! February 6, 2011
Rated 5 out of 5 by Tankless Hot Water Heater This is a great product, but you have to be willing to read all the instructions and following them. Unless you are a plumber, you must take all the instructions literally. Don't assume that any of the recommended installation instructions are overkill. One of the most important considerations is the venting kit and intake air and gas flue. This unit's manufacturer's venting system must be used, unaltered. The vent kit contains the required mechanical elements to vent direct to the exterior. Follow the mechanical code available at home depot (in laymans format , spiral bound "safe home" code check), consider the btu rating. Check your gas w.c." before you buy the unit. Most homes have 3/4" supply and >4 w.c." (1 psi = 28 w.c."), but get a gauge for about $10 to check [you may need some black pipe fittings to attach the gauge to your gas line]. We all do complicated things in our daily lives. This may be one of them for you, but if you try, you will save several thousand dollars. If you have trouble modifying your water and gas lines, read up. Black pipe is for Gas. Copper fittings are for water. Don't use galvanized pipe for water. Don't use copper for gas (brass may be ok, but it is marked for gas use). Practice soldiering with copper, but use map gas and a nozzle and hose kit (don't use propane, especially with a nozzle connected directly to a tank, it does not get hot quick enough and will very heat base on the angle of the nozzle to the tank). Heat the fitting, not the pipe. Use emery cloth to clean the contact area of the fittings and pipe, apply paste flux and use solder with flux core. The manually is very complete and you must read it all. It will show you the assemblies you must create to get your water and gas line connected. Don't plan to get this all installed in a few hours. It took me 3 hours to revamp my water, just to get my old water heater out of the closet it was in. I then spent several hours reading the installation instructions. You may want to put a sheet of plywood on the wall to mount the unit on. This is discussed in the instructions. You may want to check your water pressure. I installed a new pressure regulator and a pressure gauge on the hose bib the instructions indicate you should install to drain the tankless water heater. Make sure you have at least 40 psi. The following are some of the items I needed to purchase to install the water heater: Several black pipe nipples (around 7"), 1 tee, one cap, 90 deg elbows, Manufacturer's Vent kit, 8' of 3/4" copper pipe, (3) 3/4" copper nipples, 3/4" hose bib, 3/4" to 3/4" flex gas line 36" (7/8"o.d.), adapter 3/4 to 5/8" inside 1/2" tap, fem. 3/4" to fem. 3/4" flex water connector (acts like a union), map gas, emery cloth, paste flux, solder (flux core), 3/4" fitting copper T, (3)-3/4" sweet on copper threaded fitting... you may need other items, just read the manual and draw it out on paper before you go to home depot. When in doubt get more items than you need and save the gas and the planet. Return the stuff you bought just in case you could not read your own schematic. Good luck. February 18, 2011
Rated 5 out of 5 by Tankless Gas Water Heater II installed this water heater this weekend. It was not too complicated. Look at page 22 of the Use & Care Manual to determine the copper, fittings, black pipe, shut offs and vent kit you will need to buy. The vent kit (direct horizontal) is usually found next to the location of the water heaters. I purchased the following to complete my installation: 10' of 3/4" copper, 3/4 threaded brass hose bib, 3/4" sweated copper "T", (5) 3/4" thread sweat on copper fittings, (4) 3/4" sweat on copper elbows, 3/4" in-line ball water shutoff valve, 3/4" brass/copper nipple, (3) 3/4" black pipe nipples about 5" long, 3/4 black pipe "T",(2) 3/4 to 3/4 water supply flex connectors 18" to 24" long, 5/8 gas line 36" long with 3/4 to 3/4 and an extra fitting 3/4 to 5/8 with 1/2" tap, 3/4" black pipe cap (for sediment trap), T2 pipe dope, solder, flux, map gas, emery cloth, Horizontal vent kit, vent cap and wiring to provide 120 volt (2amp). Good luck.. this will take 2 days and you will save$2,500 over a plumbers quote (@ around 3,700.). January 31, 2011
Rated 5 out of 5 by 8.4 GPM 180,000 BTU TANKLESS GAS WATER HEATER is an excellent buy I had recently purchased this unit due to my hatred of the traditional tank that stayed on all day. This unit is great for a two and a half bath home. Endless hot water no more cold showers!!!!!! December 4, 2011
Rated 1 out of 5 by Not a recomended buy This water heater in my opinion was a very large waste of money. Not only is it not user friendly but it only works 1/4 of the time depending on your water and gas pressure. The never ending hot water is not the problem, getting the water hot in the first place is the problem. You spend more time trying to get it to turn on than you do using it. We had to install a larger gas line and still have problems getting it to run consistently. Also, if you are looking for a break in energy savings you are wrong. You end up spending more money because you waste energy trying to get it to work properly. Save your money and buy a standard larger hot water heater if you need more water. Wish we had!! January 2, 2011
2 >>


Standard Shipping includes delivery by small parcel service. Processing time varies by product.

Orders for this item may be expedited for an additional fee.

Other Delivery Options:

Express and Expedited shipping options are also available. Estimated arrival times are available in checkout.

If product is eligible for shipping to AK, HI and US Territories additional transit time and remote surcharges may apply.