Verified record
K.O. Plumbing, Heating & Cooling lists water heater installs and repairs, including tankless water heater installation, among its services on HomeAdvisor. The company describes itself there as having over 15 years of personal experience. A 2021 customer said Armando installed a tankless water heater at their house, laid out several options when quoting and completed the installation and testing. A 2021 customer wrote that two other plumbers had looked at a problem without success before Armando identified it. That 2021 customer said he replaced a pipe, moved their expansion tank so it was up to code and installed a shut-off valve for the water heater. That same 2021 customer said he called first before showing up earlier than expected. A 2020 customer described Armando's hot water heater installation as a tricky job in tight quarters. A 2019 customer said Armando showed up on time to replace a water heater and called the price very reasonable. In a 2021 review, a customer said Armando explained what broke and why and gave tips on making the system last longer.
Armando installed tankless water heater at our house this month. When I approached him for quotes, he provided various applicable options to choose from explaining each of them thoroughly. He completed the installation and testing properly taking care of every little detail. He is very professional about the quality of work and time etc. I would definitely hire him for any future repair or installation work at my house and also recommend to my friends and family. #qualityofwork #professional
We had a wonderful experience. We contacted Armando about a problem that we had two other plumbers look at with no success, and Armando was able to identify the problem and come up with a great solution that was cost-effective for us as well. He did excellent work, fixed a few other minor things that we had issues with and we could not be any happier with the work that was done. In all, he replaced a pipe, moved our expansion tank so that it was up to code, and installed a shut-off valve for our water heater. Armando was also very easy to get in touch with, was able to work around our schedules, and showed up early (he gave us a call first to make sure it was okay if he came earlier than expected). We highly, highly recommend this company and will likely use them in the future for our plumbing needs. Very professional in all respects and the work was exceptional.
Armando was excellent! Great coordination and communication. Arrived at agreed upon time, educated me on what broke and why, and gave me some tips on how to maximize the life of the system. I will use KO PRO again for future HVAC and Plumbing needs.
The serviceman, Armando, exhibited great knowledge and expertise in his ability in performing the job(installing/replacing) my water heater. I was able to single him out from other plumbers after interviewing him and other plumbers. I was 100 percent satisfied after the completion of the project. I've started to refer him to my colleagues. Should in case they have similar projects in their homes
Armando is a highly experienced licensed professional, He is very responsive and takes pride in what he does. He is also thorough and punctual. I’m extremely pleased to have his company taking care of my plumbing needs and will be sure to use K.O Plumbing, Heating and Cooling company for any future projects. He completed the project as promised and will be coming back to finish the remaining tasks this week. I highly Armando and his company K.O. plumbing, heating and cooling company.
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1 change recorded — last scanned Sep 29, 2026.
Typical New Hampshire range for this kind of work, from regional averages — not a quote from K.O. Plumbing, Heating & Cooling. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$240 – $580
Typical plumbing job around $410
Practical guidance4.1
Installation workmanship3.1