Their communication was amazing! Super fast and thorough. Family owned and treat you as family. 10/10 recommend!
Ryan C.
Testimonial on our previous website
Tankless water heaters
Tankless water heater installation and service in Gallatin, TN
We install tankless water heaters, flush and descale them, and track down the error codes that leave you without hot water. Michael, the licensed plumber who owns the company, does that work himself, and Jennifer handles the scheduling.
Installing a tankless water heater
A tankless heater hangs on the wall and heats water as you use it. Installing one means new gas and water piping to the unit, plus venting. In July 2025 Michael installed an A.O. Smith 199,000 BTU tankless unit on a garage wall. In March 2026 he installed a Navien tankless heater in Gallatin for a family that wanted to cut their energy costs.
If you're thinking about switching from a tank, call and talk it through with Michael first. He will look at where your current heater sits and what the gas, water and venting will need, and tell you whether tankless makes sense for your house.
Why tankless heaters need a yearly flush
Minerals in the water build up inside a tankless heater over time. That scale cuts efficiency and wears the unit out early. We recommend flushing your tankless water heater once a year to remove the buildup, keep it running well, and help it last.
A flush is also a good time to check the heater's maintenance valves, which are where we hook up the pump and hoses. In Gallatin we have added maintenance valves to a tankless system during a descale, and replaced leaking ones on another.
- Removes mineral and scale buildup
- Keeps the heater running efficiently
- Helps the unit last longer
- Helps head off costly repairs and cold showers
What a tankless flush involves
Michael closes the maintenance valves to isolate the heater, hooks a pump and hoses to the valve ports, and circulates a descaling solution through the unit to break up the mineral scale. Then he flushes it clean, reopens the valves and runs hot water to make sure the heater fires and holds temperature.
In Gallatin in January 2026, a customer told us their tankless heater wasn't performing like it used to. It needed descaling. After the service, the heater was back to full efficiency. A heater that has never been flushed may take longer to bring back, and an old one may have worn parts that a flush won't fix. Michael will tell you what he finds.
Error codes and no hot water
Tankless heaters show an error code when something is wrong. Some codes are simple. On one call, a heater was showing code 11, and Michael got it running again by replacing the igniter.
Others need more digging. In Gallatin in July 2026, a 15-year-old Noritz unit was making no hot water and showing Error Code 16 after a recent cleaning. Michael diagnosed the fault, checked the overall condition of the unit, and went over repair and replacement options with the homeowner so they could decide.
As tankless heaters age, parts wear out. Regular maintenance matters, but sometimes a repair is needed too. Michael will tell you which it is.
Tankless maintenance for VIP members
Our VIP Plumbing Membership includes one tankless water heater flush a year, or a flush for a tank heater up to 50 gallons if you have a standard heater. In August 2026 one of our VIP members in Hendersonville got her yearly tankless flush.
Members also get no dispatch fee, priority scheduling based on availability, 10% off plumbing services, an annual visual plumbing inspection and a mainline sewer camera inspection. Ask Jennifer about it when you call.
When you call
Call or text (615) 670-4049. Jennifer answers, writes down what your heater is doing and any code it shows, and gets you on the schedule. Our hours are Monday to Friday, 7 AM to 7 PM. We will also take emergency calls outside those hours when the situation warrants it.
Call or text and Jennifer will get you on the schedule.
Call or text(615) 670-4049Request a visitText usOur own work
Recent jobs
From our own job notes and photos. We list the town and month, never a customer's address.
Descaled a tankless water heater and brought it back to full working order.
NashvilleJuly 2025
A VIP member's yearly tankless water heater flush.
HendersonvilleAugust 2026
Installed a Navien tankless water heater for a family looking to lower their energy costs.
GallatinMarch 2026
Diagnosed a 15-year-old Noritz tankless heater with no hot water and Error Code 16, then went over repair and replacement options with the homeowner.
GallatinJuly 2026
The maintenance valves on a tankless heater were leaking. Michael replaced them.
GallatinOctober 2025
Honest answers & reliable service
Common questions
Can you install a tankless water heater?
Yes. Michael installs and services tankless water heaters from A.O. Smith, Navien, Rinnai and other manufacturers, and we service Noritz units too. Michael looks at your gas, water and venting first so the install is done right.
Is a tankless water heater worth the investment?
It depends on your home and how your family uses hot water. Some of our customers choose tankless to lower their energy costs. Call or text (615) 670-4049 and Michael will give you an honest answer for your house.
How often should I flush my tankless water heater?
We recommend once a year. It removes mineral buildup, keeps the heater efficient and helps it last.
My tankless heater shows an error code. Can you fix it?
Usually, yes. We have replaced igniters and diagnosed units with codes 11 and 16. Tell Jennifer the code when you call. If the unit is old and worn, Michael will go over repair and replacement options with you.
Does the VIP membership include tankless maintenance?
Yes. Members get one tankless water heater flush a year, or a flush for a tank heater up to 50 gallons.
Do VIP members pay a dispatch fee?
No. VIP members pay no dispatch fee.
Can you repair a tankless water heater?
Yes. We have replaced igniters and leaking maintenance valves, descaled units that lost efficiency, and diagnosed error codes. If a unit is old and worn, Michael will go over repair and replacement options with you.
Fast & reliable service
Request a visit
Mon to Fri, 7 AM to 7 PM. Weekend appointments subject to availability.
We noticed an unexpected increase in our water bill and suspected we had a leak somewhere. I called Michael Jr. Plumbing, and they were able to come out in less than 24 hours. Michael quickly determined that the leak was inside the house, found the source, and had it repaired in no time. I really appreciated the prompt, professional, and friendly service. It's a relief to have the problem fixed so quickly, and I'll definitely be calling Michael Jr. Plumbing again for any future plumbing needs. Highly recommend!
160+Reviews
4.9Google
Keeping your plumbing protected, one repair at a time!
What our customers say
4.9 stars from 160+ Google reviews.
I have had Michael Jr. Plumbing at my house multiple times this year for different repairs. Reliable, fast, fair priced. I would highly recommend for plumbing work you need done!
Kari Kaiser-Kaiser
Facebook recommendation, December 30, 2022
Reviews from Google, Facebook and our previous website, word for word.