- HEP Plumbing
- Tankless Water Heater

Tankless Water Heater
Tankless Water Heater | Tankless Water Heater Install | Plumbing | Harriman
Picture stepping into a Harriman shower that never goes lukewarm, while your energy bills quietly shrink in the background. HEP’s expert plumbers make that everyday luxury possible by replacing bulky, outdated tanks with sleek, on-demand technology that heats water only when you need it. With decades of local experience and a fleet stocked for same-day service, we handle every connection, vent, and safety check so you can enjoy endless hot water without a second thought.
Our tankless water heater install service is designed to be smooth from first call to final inspection. We size the unit precisely for your household’s demands, mount it to free up valuable floor space, and back the workmanship with solid warranties. Ready to enjoy reliable comfort, lower utility costs, and a greener home? Contact HEP in Harriman today and let the hot water flow on your terms.
FAQs
What are the main advantages of installing a tankless water heater in my Harriman home?
Tankless units heat water on demand, so you never run out of hot water and you eliminate standby heat loss from a storage tank. That translates into energy savings of 20–40 % compared with standard tanks. A tankless heater also takes up far less space, lasts about twice as long (20+ years with proper maintenance), and can even raise your home’s resale value. In Harriman’s variable climate, the ability to set precise outlet temperatures adds comfort and safety.
How long does a typical tankless water heater installation take, and will I be without hot water?
A straightforward replacement of a tank unit with a gas or electric tankless model usually takes 4–8 hours. More involved jobs—such as relocating the unit, upgrading venting, or upsizing gas lines—may take a full day. We schedule work so you have hot water until we’re ready to make the final changeover, minimizing downtime to 1–2 hours. We also bring the new unit up to temperature before we leave, so you can shower the same day.
Do I need to upgrade my gas line or electrical service for a tankless water heater?
Possibly. Gas-fired tankless units often need a ¾-inch gas supply and Category III/IV stainless-steel venting. Electric models may require one or more 240-volt circuits up to 60 amps each. During your free on-site estimate, we measure gas pressure, pipe size, and panel capacity to determine if any upgrades are necessary. We handle all permitting and code compliance for Harriman and Roane County so your new system is safe and legal.
What size tankless water heater do I need?
Sizing is based on flow rate (gallons per minute, or GPM) and temperature rise. We total the simultaneous fixtures you want to run—e.g., shower (2.0 GPM) + dishwasher (1.0 GPM)—and factor in Harriman’s incoming water temperature (≈55 °F). To raise that to a comfortable 120 °F (a 65 ° rise) at 3 GPM, you’d need a unit rated around 150,000 BTU/h (gas) or 24 kW (electric). Homes with multiple bathrooms often choose 8–10 GPM whole-house models or install two smaller units in parallel.
How much does a tankless water heater installation cost in Harriman, and are incentives available?
Installed prices typically run $2,800–$4,800 for a premium gas unit and $1,800–$3,200 for electric, depending on capacity, venting, and any gas/electrical upgrades. Harriman Utility Board and TVA occasionally offer $100–$300 rebates for ENERGY STAR® gas models, and federal tax credits cover 30 % of the project cost (up to $600 for gas, $2,000 for qualifying heat-pump water heaters). We handle all paperwork so you receive every available incentive.
What maintenance does a tankless water heater require, and do you offer service plans?
Annual maintenance keeps the heat exchanger clean and the warranty valid. We flush the unit with a food-grade descaling solution, inspect the burner/elements, clean the intake filter, and confirm combustion or amperage readings. In areas with hard water (many Harriman homes test 8–12 grains), we recommend installing a sediment filter and flushing every 6 months. Our Peace-of-Mind Plan includes yearly service, priority scheduling, and a 15 % discount on repairs for one low monthly fee.