---
product_id: 10152983
title: "Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation"
brand: "rinnai"
price: "฿133504"
currency: THB
in_stock: null
reviews_count: 8
url: https://www.desertcart.co.th/products/10152983-rinnai-rl75in-tankless-hot-water-heater-7-5-gpm-natural
store_origin: TH
region: Thailand
---

# Compact suitcase size 7.5 GPM max flow Circ-Logic recirculation tech Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation

**Brand:** rinnai
**Price:** ฿133504
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Never run out, never run late — hot water on demand, redefined.

## Quick Answers

- **What is this?** Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation by rinnai
- **How much does it cost?** ฿133504 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/10152983-rinnai-rl75in-tankless-hot-water-heater-7-5-gpm-natural)

## Best For

- rinnai enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Robust 12-year heat exchanger warranty means peace of mind for over a decade.
- • **Space-Savvy Design:** Compact footprint fits in tight indoor spaces—reclaim your valuable real estate.
- • **Smart Recirculation:** Circ-Logic technology adapts to your usage patterns for energy-efficient comfort.
- • **Endless Hot Water Flow:** Up to 7.5 gallons per minute keeps your busiest mornings seamless.
- • **Future-Ready Connectivity:** WiFi Controlr compatible for smart home integration (module sold separately).

## Overview

The Rinnai RL75IN is a high-efficiency, indoor tankless natural gas water heater delivering up to 7.5 gallons per minute. Its compact design fits where traditional tanks can't, while Circ-Logic technology optimizes recirculation based on your habits, saving energy and money. Backed by a 12-year heat exchanger warranty and compatible with WiFi control modules, it’s engineered for durability, convenience, and smart home readiness.

## Description

Product Description Rinnai's high-efficiency non-condensing indoor tankless natural gas water heater models offer advanced technology for your home with comfort and value. Designed to be extremely compact, this small water heater only takes up the space of a small suitcase, letting you reclaim some of your home's most valuable real estate. This smart on-demand hot water heater can be made even smarter with a Rinnai Controlr for WiFi connectivity (not included). This easy-to-install, ultra-compact unit lets you enjoy all the benefits of Rinnai tankless water heating. You'll experience clean, reliable hot water at a consistent pre-set temperature, while saving energy and precious floor space in your home. From the Manufacturer Stop planning your mornings and evenings around your water heater. Set your own schedule, thanks to the R75LSi. Ideal for two- to three-bathroom homes, the R75LSi delivers up to 7.5 gallons of hot water per minute (GPM), while saving energy and money. Mount your compact R75LSi in virtually any room, and vent directly to the outside with a single wall or roof penetration.

Review: No complaints and I definitely would recommend - Update as of 11/1/21.....OK... hot water stops(off and on) midstream without an obvious reason, so called for the repair guy.....1st time to do anything in almost 10 years. Update as of 7/5/17.....Still great, and have had zero issues. Update as of 11/12/14.....We have had our Rinnai installed now for about 44 months and it works extremely well. There can be a delay in hot water, or a cold water sandwich; if you change temperature quickly or turn off and then on after having it on for 15 seconds or more. It probably takes 30 seconds for ours to really heat up, and maybe 40-45 seconds to get really hot water in the dead of winter...this is slower than a tank heater and the only detriment I can note or am aware of at this point. Puts out plenty of HOT water for us as we can have 2 showers and laundry going in the dead of winter...it is no problem. We adjusted our tank to put out 140 degree water and we love it...again, especially in the winter. My wife used to fill our tub, and the old water heater would actually run out of hot water(it is a large tub).....this is never a problem again! I think beyond 3 uses at one time(shower, laundry, dishwash, etc) running you would have a capacity problem...or extrememly cold basement. There are two of us here most of the time with the occasional guests....2 1/2 bath, and Rinnai is in the basement and very close to our main shower/bathroom, so this helps the time as our upstairs shower can take a minute to get hot water when its cold. Also, getting water temp correct with a single turn knob may be an issue....the water temp only goes so low before it will cut off....but we found the minimum spot which is hot, but we turned up our Rinnai so we could get hotter water and ideally, more use or capacity at the same time. By the way it is not uncommon for our basement to be 50 or so degrees in the winter and this easily overcomes that. I cant say how much cash it has saved us really, but our propane bill has definitely not gone up...and I estimate our electric bill had actually dropped 10 bucks/mo., and that was with our electric going up 9% last year, and another 5% this year. We replaced the original house water heater that had gone bad after 6 years do to salt water getting through our reverse osmosis/charcoal filter/saline filtration system(we have very salty well water on the coast)and it backed into the original water heater due to a valve being left open....and then it literally ate our water heater from the inside out with just one soaking of brackish water(took about 6 months to destroy it, of course we didn't know it was happening until the rust color started to show up) but once the water started turning rusty it was obviously too late(and this was only a 6 yr old water heater. Also, since we have a whole house well reverse osmosis and double charcoal filters purified water running, we shouldnt have to flush our Rinnai like you are supposed to do with these every year(our water has about 60ppm tds), but you are supposed to flush/clean every year to remove buildup and sediments(we pay enough up front to not have this issue unless our filter goes bad or salt water gets through usually by human mistake). We paid less for this than our local plumber could buy them wholesale through his supplier(by about 150 bucks total). He said there is an even more efficient tankless Rinnai available if your interested? This got here in 2 days and just make sure to order the venting pipes and gas taps if you need them! We had our whole system installed for 1350 total.....so it cost us about 500 bucks more than a good replacement standard tank water heater....I am sure we have gotten this back or will be very close by the end of this year. I believe we have saved 15 bucks per month on average? Make sure your gas pipes have enough flow.....Ive heard this can be an issue also? We really love ours. If anything happened we would probably just upgrade to the more efficient unit. Our unit is about 3 years installed now, maybe longer and I see others have issues, but we really have to recommend at this point. I will edit should anything come up as I think this needs to last at least 12 years for the return to really pay off. Propane and electricity is getting more expensive and this helps through efficiency to combat costs. Installed 03/2012
Review: Amazing product! Very happy with my purchase! - I almost never write reviews, but felt compelled to write one for this purchase. I bought this product over a year ago, and wish I would've done it sooner! I went through two hot water tanks in 15 years and wasted so much money due to inefficiency. This heater is extremely reliable and have yet to have any problems with it. We can easily run two showers at once and have laundry and dishwasher running all at the same time. This heater can pump out a tremendous amount of hot water. The average shower requires 2.5 gallons a minute. If you do the math, 9.4 gallons is alot. It can take up to 20 or 30 secs in a large house to get hot water but that's no different than a hot water tank. I installed the unit myself no problem. Venting the unit through the concrete foundation was the most challenging part of the install. It does require some plumbing skills but all in all wasn't bad. I think placement of the unit is really important and should be as close as possible to your venting location. Ofcourse you also need to have your cold water feed, proper gas line, and a nearby outlet to power it. I mounted it on plywood which I tapconed to the concrete wall. For the water feed I recommend extending your water line with Pex, mainly because its easy to work with and its cheap. I know this unit is saving me alot of money in natural gas. My old tank was a zone off my hot water boiler which meant my boiler was running year around, even in the summer when it was warm out, just to keep hot water tank heated. Now my boiler only runs half the year and the on demand heater kicks only when hot water is needed and doesn't waste gas when you're not using it. Fantastic product! I removed the front cover to take a look under the hood, it looks well built with quality parts. This prompted me to put one in my 5th wheel camper. I can't say anything about customer service because I haven't had any reason to call them. I don't think there's much more to say except I highly recommend this product and is worth every penny!

## Features

- Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE160iN model
- Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 7.5 GPM (5 fixtures at once)
- Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
- Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
- Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Rinnai |
| Capacity | 7.5 Gallons |
| Color | Gray |
| Power Source | Gas Powered |
| Product Dimensions | 17.5"W x 31"H |
| Wattage | 1200 watts |

## Product Details

- **Brand:** Rinnai
- **Capacity:** 7.5 Gallons
- **Color:** Gray
- **Power Source:** Gas Powered
- **Product Dimensions:** 17.5"W x 31"H

## Images

![Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation - Image 1](https://m.media-amazon.com/images/I/61p5s6k1wkL.jpg)
![Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation - Image 2](https://m.media-amazon.com/images/I/712bkI7cvxL.jpg)
![Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation - Image 3](https://m.media-amazon.com/images/I/71DteCsyXZL.jpg)
![Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation - Image 4](https://m.media-amazon.com/images/I/71GhP2mLeSL.jpg)
![Rinnai RL75IN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation - Image 5](https://m.media-amazon.com/images/I/71QB3pgsBZL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: If I get a bit too tipsy and pass out in the shower and wake up six hours later will I still have hot and toasty water?**
A: Yep. The water stays hot as long as you keep running water.

**Q: will there be enough water for 2 or even 3 people taking showers at once?**
A: Two for sure; maybe three. Always depends on the water flow rate.  The minimum flow (to turn on the water heater) is 0.4 gallons per minute. The max output for this unit is 7.5 GPM at 120 degrees. We run our RU98 at 115 degrees and it's plenty hot enough. Max flow for the RU98 is almost 10 GPM. If you absolutely need the capability for 3 showers at one time, consider a higher capacity unit. Also consider how far the unit is from the point of use (shower). My unit is 50 feet (pipe length) from the shower and wastes about 2.5 gallons of cold water before the hot water shows up.

**Q: i have a 4600 sq ft house w/ 3.5 bathrooms.  will this unit be appropriate?**
A: no - we had a 4600 sq ft home with 4 baths and 6 adults.  we had two installed and never ran out of water ever even if all other appliances were going and we were all taking showers.

**Q: What does this come with, and what do you need to purchase extra in order to install it and run it?**
A: Valves.... You will need hangers for the wall, venting system, and lots of sharkbite water fittings. A simple 4 hour DIY. with all the right parts.

## Customer Reviews

### ⭐⭐⭐⭐⭐ No complaints and I definitely would recommend
*by M***H on June 1, 2012*

Update as of 11/1/21.....OK... hot water stops(off and on) midstream without an obvious reason, so called for the repair guy.....1st time to do anything in almost 10 years. Update as of 7/5/17.....Still great, and have had zero issues. Update as of 11/12/14.....We have had our Rinnai installed now for about 44 months and it works extremely well. There can be a delay in hot water, or a cold water sandwich; if you change temperature quickly or turn off and then on after having it on for 15 seconds or more. It probably takes 30 seconds for ours to really heat up, and maybe 40-45 seconds to get really hot water in the dead of winter...this is slower than a tank heater and the only detriment I can note or am aware of at this point. Puts out plenty of HOT water for us as we can have 2 showers and laundry going in the dead of winter...it is no problem. We adjusted our tank to put out 140 degree water and we love it...again, especially in the winter. My wife used to fill our tub, and the old water heater would actually run out of hot water(it is a large tub).....this is never a problem again! I think beyond 3 uses at one time(shower, laundry, dishwash, etc) running you would have a capacity problem...or extrememly cold basement. There are two of us here most of the time with the occasional guests....2 1/2 bath, and Rinnai is in the basement and very close to our main shower/bathroom, so this helps the time as our upstairs shower can take a minute to get hot water when its cold. Also, getting water temp correct with a single turn knob may be an issue....the water temp only goes so low before it will cut off....but we found the minimum spot which is hot, but we turned up our Rinnai so we could get hotter water and ideally, more use or capacity at the same time. By the way it is not uncommon for our basement to be 50 or so degrees in the winter and this easily overcomes that. I cant say how much cash it has saved us really, but our propane bill has definitely not gone up...and I estimate our electric bill had actually dropped 10 bucks/mo., and that was with our electric going up 9% last year, and another 5% this year. We replaced the original house water heater that had gone bad after 6 years do to salt water getting through our reverse osmosis/charcoal filter/saline filtration system(we have very salty well water on the coast)and it backed into the original water heater due to a valve being left open....and then it literally ate our water heater from the inside out with just one soaking of brackish water(took about 6 months to destroy it, of course we didn't know it was happening until the rust color started to show up) but once the water started turning rusty it was obviously too late(and this was only a 6 yr old water heater. Also, since we have a whole house well reverse osmosis and double charcoal filters purified water running, we shouldnt have to flush our Rinnai like you are supposed to do with these every year(our water has about 60ppm tds), but you are supposed to flush/clean every year to remove buildup and sediments(we pay enough up front to not have this issue unless our filter goes bad or salt water gets through usually by human mistake). We paid less for this than our local plumber could buy them wholesale through his supplier(by about 150 bucks total). He said there is an even more efficient tankless Rinnai available if your interested? This got here in 2 days and just make sure to order the venting pipes and gas taps if you need them! We had our whole system installed for 1350 total.....so it cost us about 500 bucks more than a good replacement standard tank water heater....I am sure we have gotten this back or will be very close by the end of this year. I believe we have saved 15 bucks per month on average? Make sure your gas pipes have enough flow.....Ive heard this can be an issue also? We really love ours. If anything happened we would probably just upgrade to the more efficient unit. Our unit is about 3 years installed now, maybe longer and I see others have issues, but we really have to recommend at this point. I will edit should anything come up as I think this needs to last at least 12 years for the return to really pay off. Propane and electricity is getting more expensive and this helps through efficiency to combat costs. Installed 03/2012

### ⭐⭐⭐⭐⭐ Amazing product! Very happy with my purchase!
*by C***J on October 22, 2021*

I almost never write reviews, but felt compelled to write one for this purchase. I bought this product over a year ago, and wish I would've done it sooner! I went through two hot water tanks in 15 years and wasted so much money due to inefficiency. This heater is extremely reliable and have yet to have any problems with it. We can easily run two showers at once and have laundry and dishwasher running all at the same time. This heater can pump out a tremendous amount of hot water. The average shower requires 2.5 gallons a minute. If you do the math, 9.4 gallons is alot. It can take up to 20 or 30 secs in a large house to get hot water but that's no different than a hot water tank. I installed the unit myself no problem. Venting the unit through the concrete foundation was the most challenging part of the install. It does require some plumbing skills but all in all wasn't bad. I think placement of the unit is really important and should be as close as possible to your venting location. Ofcourse you also need to have your cold water feed, proper gas line, and a nearby outlet to power it. I mounted it on plywood which I tapconed to the concrete wall. For the water feed I recommend extending your water line with Pex, mainly because its easy to work with and its cheap. I know this unit is saving me alot of money in natural gas. My old tank was a zone off my hot water boiler which meant my boiler was running year around, even in the summer when it was warm out, just to keep hot water tank heated. Now my boiler only runs half the year and the on demand heater kicks only when hot water is needed and doesn't waste gas when you're not using it. Fantastic product! I removed the front cover to take a look under the hood, it looks well built with quality parts. This prompted me to put one in my 5th wheel camper. I can't say anything about customer service because I haven't had any reason to call them. I don't think there's much more to say except I highly recommend this product and is worth every penny!

### ⭐⭐⭐⭐⭐ Replacing my 2007 R94LSI unit
*by M***B on February 16, 2023*

I purchased this RL94iP unit to replace my R94LSi unit as a direct swap. My original unit started leaking after flushing it and instead of waiting a day or more for a plumber to come out and tell my my heat exchanger was leaking, I purchased this newer model on Amazon and had it delivered to my house in 2 days!! This is 2 days faster than any of the home box stores could have had it too my door. I would have been looking at about a week without hot water if I would have waited on a plumber to do everything. I also found that Rinnai keeps these prices locked because every place I could buy it direct was exactly the same price, to the penny! I installed it the same day I received it. I mounted it using the same mount points as the original unit and reconnected all the original connections, flushed it with clean water, and plugged it in. It fired right up and and I had hot water again! I was disappointed that I could only turn this unit up to 120°. We kept our original unit at 130° and could have turned it up to 140°. We liked this because our Master Bath is so far from the water heater and the water temp at the shower isn't as hot. At 120° I can run my shower without any cold water on the far end of the house. I'm going to do a little research and see if this max temp can be increased. The original unit was not maintained correctly before I purchased the home in 2016. I could see where some soldering repairs had been made on it and was told by a plumber a couple years ago that this unit would soon need to be replaced. We live on an unfiltered well with not too hard water (18PPM) but regular flushing is still required. My original unit also did not have the plumbing flush kit. I was told the original units did not come with this as a standard. I'll be hiring a plumber later to install this kit and make flushing it a lot easier. We love our endless hot water and the dependability of our Rinnai hot water heater. Now I just need to get the original unit repaired to install it in my shop.

## Frequently Bought Together

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- Rinnai 223181, Small, White

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-01-24*