---
product_id: 39651068
title: "Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT"
brand: "gasflex"
price: "¥51359"
currency: JPY
in_stock: false
reviews_count: 7
url: https://www.desertcart.jp/products/39651068-excel-pro-tankless-gas-water-heater-natural-gas-6-6
store_origin: JP
region: Japan
---

# Ideal for whole house 6.6 GPM flow rate Instant temp rise 35°F Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT

**Brand:** gasflex
**Price:** ¥51359
**Availability:** ❌ Out of Stock

## Summary

> 💧 Hot Water, No Waiting—Join the Tankless Revolution!

## Quick Answers

- **What is this?** Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT by gasflex
- **How much does it cost?** ¥51359 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/39651068-excel-pro-tankless-gas-water-heater-natural-gas-6-6)

## Best For

- gasflex enthusiasts

## Why This Product

- Trusted gasflex brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Free Flue Kit Included:** Get started right away with a complimentary stainless steel flue kit, making installation a breeze.
- • **Smart Modulation Technology:** Automatically adjusts heat output based on water flow, optimizing energy use and comfort.
- • **Efficient Hot Water Delivery:** Experience a powerful 6.6 GPM flow rate, ensuring your entire home enjoys hot water on demand.
- • **Durable Copper Heat Exchanger:** Built to last with a pure copper heat exchanger, ensuring longevity and reliability.
- • **Versatile Installation Options:** Power vented for flexible installation—choose rooftop or wall mounting to fit your space.

## Overview

The Excel Pro Tankless Gas Water Heater delivers an impressive 6.6 GPM of hot water, perfect for whole-house applications. With smart modulation technology, it adjusts heat output based on demand, ensuring efficiency and comfort. Designed for versatile installation, it includes a free flue kit and features a durable copper heat exchanger, making it a reliable choice for modern homes.

## Description

This compact , yet powerful unit - with gas inputs up to 140,000 BTU per hour - can meet all the hot-water needs of a small to medium American home or apartment. Designed to virtually do anything a 40-gallon tank-type water heater can do and much more The Wall mounted Excel Pro is design to work with hydronic baseboard or radiant floor heating applications, as well as provide domestic hot water to plumbing fixtures and appliances. LCD Display Control: Just set the desired water temperature The Excel Pro has an energy factor of 0.84-0.85. Excel Pro: Modulating Technology Tankless water heaters can be further divided into two categories according to their heating capability: "full on/full off" versus "modulating". Full on/full off units do not have a variable power output level; the unit is either fully on or completely off. This can cause an annoying and possibly hazardous variation of hot water temperature, as the flow of water through the heater varies. Modulated tankless water heaters change their heat output in response to the flow rate of water running through the unit. The Excel Pro comes with a display panel where you can set the output temperature and regardless of water flow the unit modulates the fire power. Pure Copper Heat Exchanger * As used by other top of the line tankless gas water heater manufacturers like Rinnai, Takagi, Rheem and Noritz. Features & Benefits Super compact 14.5" x 23" x 5.5" size 84%+ thermal efficiency 140,000 BTU maximum input 6.6 gallons/ minute capacity at 35F degree rise Minimum activation flow rate of 0.5 gpm Electronic ignition. Has a Power vented fan that Vents directly vertically or horizontally with 3” stainless steel flue 3' long flue and elbow included. Can be used in recirculation and space heating application . Delivers 6.6 gpm of hot water with a 35°F Instant Temperature Rise (Equivalent to 5.5gpm with a 45F temp Rise). European Model Digital Display is in Celsius.

## Features

- About this item
- Modulates heat output in response to the flow rate of water running through the unit.     Power vented directly vertically (rooftop) or sideways (wall) via Stainless Steel CAT III Flue 3.5" Diameter Included (20")     NATURAL GAS - European Model - Digital Display is in Celsius     Delivers 6.6 gpm of hot water with a 35°F Instant Temperature Rise (Equivalent to 5.5gpm with a 45F temp Rise)     Certified for Installation in Manufactured (Mobile) Homes Pure Copper Heat Exchanger    ›See more product details

## Images

![Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT - Image 1](https://m.media-amazon.com/images/I/71pgcpyl3LL.jpg)
![Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT - Image 2](https://m.media-amazon.com/images/I/71roQz0o1BL.jpg)
![Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT - Image 3](https://m.media-amazon.com/images/I/71+Oq8jH3JL.jpg)
![Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT - Image 4](https://m.media-amazon.com/images/I/71Jd7vwfuJL.jpg)
![Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT - Image 5](https://m.media-amazon.com/images/I/81qt06CUKrL.jpg)

## Customer Reviews

### ⭐ 







  
  
    Faulty/Carbon monoxide leak after install
  

*by S***N on Reviewed in the United States on July 10, 2019*

I’m a penny pincher and love to save a buck. So, when I found that I could buy this and pay to have it installed for around $550, I jumped on it, especially since it was tankless and that’s all the rage!  HOWEVER, it came with the wrong size FLUE/fittings kit to work correctly AND put off a very bad smell-chemical/something getting hot. I began to get sleepy, but honestly, it was late. My tongue started tingling & I thought it was just my imagination UNTIL, my carbon monoxide detector went off!!!  I know it is odorless and tasteless, but that’s my experience. I quickly got my three kids and two dogs out of the house. The fire dept, gas company, & plumber all had to be called. My family could have DIED!  Thank got for those detectors!  If you don’t have them, install several!!!Thankfully, I didn’t have to shell out $$ for a hotel (none would have taken my dogs anyway) & I stayed at my mom’s.Initially, i wondered if it was a faulty installation, but when I purchased another water heater, I had to use a different plumber due to a scheduling conflict of the first one (I needed hot water ASAP because I had Beene without it for three days and had been bathing at my mom’s) but the new plumber said the initial installation looked correct when he removed this water heater. He kept getting an E2 code when he first arrived and tried to fix it rather than purchase a new one too.I will say that Amazon & the seller were WONDERFUL to work with on my refund& I hate to leave a negative review. Nevertheless, I wouldn’t want someone to deal with what I did and if someone without detectors had bought it, they would have died!!!  Lesson learned though-don’t take the cheap way out because it could cost lives!

### ⭐ 







  
  
    Did not provide full refund on defective unit!
  

*by E***R on Reviewed in the United States on April 6, 2019*

I returned this unit as it was missing parts and did not function, as if it was used before, and the seller kept over $100Not recommended!!!

### ⭐⭐⭐⭐⭐ 







  
  
    Worth every penny! Great for replacing an existing tankless units.
  

*by K***H on Reviewed in the United States on July 29, 2019*

Our 14-year-old Rinnai tankless water heater developed a pinhole leak in the heat exchanger and wasn't worth fixing, so we opted for this unit because of our tight budget.  Naturally, all the plumbing and fittings (such as the shut-offs, maintenance valves and pressure relief valve) were already in place, having been installed by a plumber. There was already a hole in the wall for the exhaust, and there was already a grounded outlet nearby. (Obviously if you're using this for new construction or replacing a tank-style water heater, you'll have to start from scratch.)Installing the unit was a matter of turning off the gas and electricity, draining the old unit, removing the old unit and venting, and installing the Excel in the same place. It fit even better because it's slightly smaller than the old unit. We did have to make adjustments because the Excel gets combustion air from vents on the side of the unit, so the exhaust vent pipe (which is included--bonus!!)  is just 3" in diameter, whereas our old Rinnai had a dual-layer exhaust pipe that drew in the combustion air from outside the building, and thus had a larger-diameter pipe. (We ended up re-using part of the old Rinnai vent almost as a wall thimble, which centered the new vent in the oversize hole.)There is a certain minimum flow required for the unit to kick on (just like our old Rinnai). You may have to turn the hot water faucet up to full blast for a few seconds to before you hear the "whoosh" of the gas jets coming on. After that, you can usually get away with turning the flow back down to normal.We would absolutely buy this unit again. We were quoted $1,500 to replace our Rinnai with a tank-style unit (because supply lines would have to be moved) and over $3,000 to replace with a new tankless unit (because apparently the plumber thought we were easy marks.) So this easily saved us a thousand dollars.PROS• You cannot be the price for a 6.6 GMP unit.• Even with the extra $38 for the buyer protection policy, this unit is still cheaper than the other units I looked at by over $125.• It comes with a brass reducer for the gas line fitting.• It comes with the horizontal venting.• The LED display is super-simple and has animated blue flame and showerhead icons that appears when the hot water is running somewhere in the house.• The unit makes more than enough hot water for our 3-bedroom house. It's not uncommon for someone to be in the shower when someone else is doing laundry. No problems at all.CONS• The instructions read as though they were translated by Google Translate from Chinese into German into English. They're mainly nonsense. However, if you are replacing an existing tankless unit, it will be obvious what goes where and you will rarely refer to the instructions. The only nugget of wisdom I got out of the instructions was a factoid that the unit will shut itself off as a safety once it has run continuously for 30 minutes. You're supposed to turn the water off for a second then back on to reset it.  Ours has been installed for 2 weeks, and I have honestly not noticed that it has ever turned itself off.• You may have to buy a couple of reducing fittings for the cold in and hot out nipples, depending on your setup.• Very minor--this unit was manufactured for the European market so the display is in Celsius. Just ask your smart phone to translate that into Fahrenheit for you so you can set the temp.• Not sure how I feel about this, but it does have a manufacture date sticker that makes it about 15 years old. It is obviously brand new/never used, and I don't think tankless water heater technology has changed that much since it was manufactured, so I'm OK with it. I did buy the extra protection policy, however.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-22*