# Does Tampa Hard Water Ruin a Tankless Water Heater | Titan Plumbing & Electric > Tampa water runs 7 to 10 grains. What that scale does inside a tankless unit, how often to flush, and when the install needs a bigger gas line or panel. Canonical HTML: https://www.titanplumbingandelectric.com/blog/tampa-hard-water-tankless-water-heater/ ![](/images/shared/hero-bg.webp) # Does Tampa Hard Water Ruin a Tankless Water Heater Maintenance September 2026 ![Tankless water heater installed on a Tampa garage wall](/images/pages/tankless-water-heater-installation-tampa.webp "Tankless water heater installed on a Tampa garage wall") Tampa Bay water sits around 7 to 10 grains of hardness. That mineral load settles in a tank as sediment. In a [tankless](/plumbing/tankless-water-heaters/) unit it plates the heat exchanger. The water still gets hot for a while. Flow drops. The unit starts to short-cycle. Then it throws a scale code or a cold burst in the shower. A [tankless water heater](/plumbing/tankless-water-heaters/) installation in Tampa has to match that water and the gas or panel. The brochure photo does not. ## What scale does inside the unit A tank stores 40 or 50 gallons and reheats the batch. Scale falls to the bottom and buries the element. You have seen that cut-open tank on our videos. A tankless unit has no tank. Cold water runs through a narrow heat exchanger the moment you open a tap. Calcium sticks to those passages. The opening gets smaller. The burner works harder to hit the set temperature. Incoming Tampa groundwater is already cool. A scaled exchanger cannot keep up when two showers run. An annual flush with vinegar or a manufacturer descaler dissolves that film if you start before the passages close. Skip three summers and the flush is a long visit, or a heat exchanger. ## Flush, softener, or both Flush the unit once a year if you stay on city water with no treatment. That keeps most warranties valid. Rheem, A.O. Smith, and the electric lines we install all expect that service in hard-water markets. A [water softener](/plumbing/water-softeners/) in front of the unit slows the scale. It does not replace the flush. Salt-free conditioners help some surfaces. They do not strip a heat exchanger that is already plated. If you are replacing a tank that died at year eight, treat the water before you hang the new unit. The next heater fails the same way if the incoming line is unchanged. ## Gas line, vent, and the electric panel A gas tankless unit often needs a larger gas pipe than the 40-gallon tank it replaces. The old tank sipped gas. The tankless unit asks for a lot of BTUs at once. Undersized pipe is the usual reason a new unit flames out when the second shower opens. An electric tankless unit asks the panel for a continuous load. A 100-amp service that already runs the AC and dryer rarely has room. That is a panel conversation before anyone orders the box, not after it is on the wall. Venting on gas units has to match the model and the run through a Tampa attic. Condensing units use PVC. Non-condensing units need the metal vent the listing calls for. Mixing those is how a job fails inspection. ## How to size it Square footage is the wrong number. Count the fixtures that run at the same time and the incoming water temperature. Two showers plus a dishwasher is a different unit than one bath. A unit that is too small runs lukewarm at 7 a.m. A unit that is too large costs more to buy and still scales if you skip the flush. ![Tankless water heater on a Tampa garage wall](/images/pages/tankless-water-heater-installation-tampa.webp "Tankless water heater installation in a Tampa garage") ## What the install actually includes Permit, isolation valves for the yearly flush, the gas or electrical work, and a flow test before anyone leaves. If the old tank sat in a drain pan with a rust ring, that pan and the T&P discharge get checked too. We do not publish a Titan price here. Gas, electric, vent, and whether the panel or the gas meter has to move all change the number. You get a flat rate after we see the wall and the service. If the tank is already leaking, that is [water heater repair](/plumbing/water-heater-services/) or [emergency plumbing](/plumbing/24-hour-emergency-services/) the same day, Monday through Saturday. If you are planning the swap, start on [tankless water heater installation](/plumbing/tankless-water-heaters/) and ask for the hardness and the load calc in the same visit. (813) 933-8010. License CFC1430231 and EC13012958. Need help with this? Talk to a real Tampa dispatcher. Same-day service, flat-rate pricing, A+ BBB rated since 1994. [Call (813) 933-8010](tel:+18139338010) [Request Service](/contact) #### On this page #### Related Maintenance - [![Titan fleet ready for Tampa storm season](/images/shared/truck-fleet.webp)Tampa Storm Prep: Plumbing & Electrical Checklist Before Hurricane Season May 2026](/blog/storm-prep-checklist/) - [![Hydro jetting equipment used on a Tampa drain](/images/jobs/dan-m.webp)Hydro Jetting vs Drain Snaking: Which One Actually Solves the Clog? February 2026](/blog/hydro-jetting-vs-snaking/) - [![Titan plumber locating a slab leak in Tampa](/images/team/team.webp)Slab Leak Warning Signs Tampa Homeowners Should Never Ignore December 2025](/blog/slab-leak-warning-signs/) Need it fixed today? Talk to a real Tampa dispatcher. family-owned, Tampa-based · Same-day service [(813) 933-8010](tel:+18139338010) [Request Service](/contact) ## Find Us in Tampa Our office is at 8407 N Mitchell Ave in Tampa. We serve homeowners and businesses throughout Tampa Bay. Hillsborough, Pasco, and Pinellas counties. [](https://www.google.com/maps/search/?api=1&query=Titan%20Plumbing%20and%20Electric%208407%20N%20Mitchell%20Ave%20Tampa%20FL%2033604)[View on Google](https://www.google.com/maps/search/?api=1&query=Titan%20Plumbing%20and%20Electric%208407%20N%20Mitchell%20Ave%20Tampa%20FL%2033604) Titan Plumbing & Electric - 8407 N Mitchell Ave Tampa, FL 33604 - [(813) 933-8010](tel:+18139338010) - Mon-Sat: Open 24 hours Sun: Closed Need it fixed today? Talk to a real Tampa dispatcher. Same-day service · Flat-rate pricing · A+ BBB [Call (813) 933-8010](tel:+18139338010) [Get Directions](https://www.google.com/maps/dir/?api=1&destination=8407%20N%20Mitchell%20Ave%2C%20Tampa%2C%20FL%2033604)