--- title: "K.O. Plumbing, Heating & Cooling" description: "K.O. Plumbing, Heating & Cooling lists water heater installs and repairs, including tankless water heater installation, among its services on HomeAdvisor. " doc_version: "2026-10-02" last_updated: "2026-10-02" --- # K.O. Plumbing, Heating & Cooling **Trade:** Plumbing · **Address:** Hudson, NH · **Languages:** English, Spanish **Rating: 3.2/5** (medium confidence) — from 18 reviews across 1 sources. 100% of sentiment-scored reviews read net-positive. Last 6 months: 0 reviews, 0 negative. ## The honest read 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. **Strengths:** - Tankless water heater — a 2021 customer described the install and testing - Expansion tank fix — a 2021 customer said he moved it up to code - On-time arrival — a 2019 customer said Armando showed up on time ## Claims & citations Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication. - Lists water heater installs and repairs, including tankless installation, on HomeAdvisor _(confidence: high)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “Services offered (HomeAdvisor): Water Heater Installs & Repairs, Water Heater Installation and Replacement, Tankless Water Heater Installati…” - Describes itself on HomeAdvisor as having over 15 years of personal experience _(confidence: medium)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “About (HomeAdvisor, self-described): With over 15 years of personal experience, we pride our company on reliability, great communication, in…” - A 2021 customer said Armando installed and tested a tankless water heater _(confidence: high)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “5★ Armando installed tankless water heater at our house this month. When I approached him for quotes, he provided various applicable options…” - A 2021 customer said Armando identified a problem two other plumbers could not, replaced a pipe and moved an expansion tank up to code _(confidence: high)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “5★ We had a wonderful experience. We contacted Armando about a problem that we had two other plumbers look at with no success, and Armando w…” - A 2020 customer described a hot water heater installation in tight quarters _(confidence: high)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “5★ Armando was extremely professional with my hot water heater installation. It was a tricky job in tight quarters, but he did an excellent …” - A 2019 customer said Armando showed up on time to replace a water heater at a very reasonable price _(confidence: medium)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “5★ Armando is a man of his word. He showed up on time and did an excellent job replacing my water heater. The price was very reasonable. I w…” - HomeAdvisor shows 5.0 stars from 18 ratings _(confidence: high)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “HomeAdvisor: 5.0★ from 18 ratings” - Specializes in Plumbing _(confidence: high)_ - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “5★ Armando installed tankless water heater at our house this month. When I approached him for quotes, he provided various applicable options…” - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “5★ We had a wonderful experience. We contacted Armando about a problem that we had two other plumbers look at with no success, and Armando w…” - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “5★ Armando is a man of his word. He showed up on time and did an excellent job replacing my water heater. The price was very reasonable. I w…” - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html) — “Services offered (HomeAdvisor): Water Heater Installs & Repairs, Water Heater Installation and Replacement, Tankless Water Heater Installati…” ## License Status: **not_found** — verified against the official NH state registry, never self-reported. Re-check at the official registry: https://forms.nh.gov/licenseverification/ ## Sources - [HomeAdvisor](https://www.homeadvisor.com/rated.KOPlumbingHeating.93381173.html): 5.0★ from 18 ratings ## Recent reviews - **5/5 · HomeAdvisor · Pradnya G. · 2021-05-15**: 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 … - **5/5 · HomeAdvisor · Ines K. · 2021-04-14**: 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 tha… - **5/5 · HomeAdvisor · Isaac P. · 2021-04-08**: 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. - **5/5 · HomeAdvisor · Freda A. · 2020-08-04**: 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'… - **5/5 · HomeAdvisor · Jennifer P. · 2020-01-19**: 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 … - **5/5 · HomeAdvisor · Eva J. · 2020-01-13**: Incredibly accommodating of a non-emergency issue that I wanted done on a tight timeline. - **4.5/5 · HomeAdvisor · Christine K. · 2020-01-10**: I was very pleased with the work and the timely response I will recommend them to my friends - **5/5 · HomeAdvisor · Julia G. · 2020-01-05**: Armando was extremely professional with my hot water heater installation. It was a tricky job in tight quarters, but he did an excellent job - **5/5 · HomeAdvisor · Jian R. · 2019-12-16**: Got my old water heater replaced with the new high efficient one, very professional service. - **5/5 · HomeAdvisor · Adrienne S. · 2019-12-07**: He was polite, thorough, did the job requested. He was on time and cleaned up. --- Data freshness: last scanned 2026-09-29T21:22:55.643Z. Cite as: K.O. 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