SAWS water on the north edge of Bexar County
Timberwood Park sits inside the service area of the San Antonio Water System, which took over a patchwork of smaller north side water providers over the years as the city grew toward Comal County. Today most homes get SAWS water, which is anchored by the Edwards Aquifer and supplemented with water from SAWS's other projects as conditions require.
One of those supplementary projects is local. SAWS lists a Timberwood Park project among its three small Trinity Aquifer operations in northern Bexar County, a handful of wells drawing from the older limestone that lies beneath the Edwards in this part of the county. Trinity water is often harder than Edwards water and can be higher in sulfate, though SAWS blends and treats it so that it is a small fraction of the overall supply.
A few properties on the fringes still have private wells, either as the main supply or for irrigation. Those homeowners are on their own for testing and treatment, and well water here tends to be even rougher on heaters than the SAWS supply, with more scale and sometimes a sulfur smell.
Acre lots, septic tanks and big garages
Development in Timberwood Park began in the 1970s and continued in phases for decades, so the community holds everything from sprawling one-story ranch homes with side-entry garages to large two-story stone houses built in the 2000s. Wooded lots along Canyon Golf Road and the winding streets off Bulverde Road and Evans Road give each house room for a three-car garage, which is where most Timberwood Park heaters are found.
Because so many homes are on septic systems rather than sewer, a heater's relief valve and drain pan lines need to end somewhere sensible, not into a cleanout or straight onto a drain field. Bexar County has been working on plans to bring sewer to parts of the area, but for now many Timberwood Park homes still pump to their own tanks, and plumbers working here should know where the septic lid is before they drain a heater into a floor drain.
Larger homes frequently have two water heaters, one feeding the master suite and one serving the kitchen and secondary baths, and a recirculation pump to cut the wait at faucets far from the garage. Those extra pieces need upkeep of their own: recirc pumps fail, check valves stick and timers drift after power outages.
Hill Country weather on the north side
Timberwood Park sits higher than most of San Antonio, above 1,100 feet in places, and winter fronts arrive a degree or two colder than they do downtown. Rolling blackouts during the February 2021 storm stretched for days up here, and homes with tankless units on outside walls or water lines through unheated garages took serious damage. Insulating exposed lines and keeping a heater's drain and relief valve accessible makes the next freeze less costly.
Summers bring the opposite problem. Garages facing west on these hillside lots can top 100°F inside in August, which wears on gas control valves and the plastic parts of power-vent heaters. Severe thunderstorms roll off the Hill Country, and power surges and lightning strikes on the ridge have taken out electronic controls on tankless units more than once.
Common Timberwood Park water heater calls
- Thick limestone sediment in tanks that have run ten years without a drain in a household of five.
- Tankless units throwing scale codes on unsoftened SAWS and Trinity blend water.
- Recirculation pumps and check valves failing in big homes with long pipe runs.
- Surge-damaged control boards after summer storms and grid trouble.
- One of two tanks dying early in homes where the second heater carries most of the load.
- Sulfur smell in hot water from homes on private Trinity wells.
Typical water heater costs in Timberwood Park
| Job | Typical Timberwood Park range | Notes |
|---|---|---|
| Igniter, flame sensor or thermocouple | $160–$310 | |
| Gas control valve | $390–$650 | |
| Electric element and thermostat | $170–$340 | Scale is the usual culprit |
| Tank flush or tankless descale | $150–$320 | Heavy limestone adds time |
| Recirculation pump repair or replacement | $275–$650 | Varies by pump and timer |
| 50 gallon tank replacement | $1,600–$3,200 | Two-heater homes pay per tank |
| Tankless installation | $3,500–$6,500 | Softener strongly recommended |
Prices in Timberwood Park run a little above central San Antonio. The homes are bigger, the heaters often larger, and the drive from the city's southern and eastern shops is longer. A 75-gallon tank, a second heater swapped at the same time or a softener added to protect a new tankless unit will land the job at the top of these ranges.
Permits without a city
Since Timberwood Park is unincorporated, San Antonio's city inspectors do not check water heater swaps here the way it does inside city limits. Bexar County handles the permits that do exist for unincorporated property, mostly septic systems, floodplain and some development questions, through its Public Works and environmental services offices. A licensed plumber should tell you up front whether any permit applies to your job, and if so, pull it.
The state rules still apply in full. Anyone installing or repairing a water heater must hold a Texas plumbing license, a credential once handled solely by the plumbing examiners board and now shifting to TDLR, and the installation must follow the plumbing code. Ask the plumber for their license number and look it up yourself on the state's site.
CPS Energy power, gas only on some streets
Electricity in Timberwood Park comes from CPS Energy, San Antonio's city-owned utility, so there is no retail power shopping like in Houston or Dallas. CPS Energy also delivers natural gas, but its gas mains do not reach every part of a community built on rocky lots far from the city core. Plenty of homes here are all-electric, and some use propane tanks set at the back of the property for heating and water.
That makes the fuel question important when a heater is replaced. A propane house can run a tankless heater well, though the gas line and regulator have to be sized for it. A heat pump unit suits an all-electric Timberwood Park house whose garage bakes all summer, and CPS Energy has run efficiency rebates on such units at times. Moving from electric to gas only makes sense if a main is already on your street.
Softening and upkeep on limestone water
Most large Timberwood Park homes have a softener, or at least a loop where one was meant to go. Running it is the best single thing a homeowner can do for a heater on this water, and it matters even more for a tankless unit, which can lose a lot of flow in a year of untreated use. If the softener uses salt, keep the brine tank full and have it checked when the hardness creeps back.
Without a softener, drain the tank every year and descale tankless units once or twice a year. The tankless descaling and repair service covers the flushing kit, isolation valves and inlet screen cleaning. Turning a tank down to 120°F also slows calcium buildup and reduces the risk of scalding young grandkids during holiday visits.
When to replace instead of repair
A newer heater with a dead igniter or a stuck valve is worth repairing. A tank past ten years with a rumbling bottom, slow recovery and a crusted relief valve is close to the end, and in a home with two heaters it often makes sense to replace both together so they age evenly. If either sits in a spot where a leak would ruin finished space, fit the new unit with a pan, a water sensor and a shutoff valve that closes on its own.
Around Timberwood Park
Stone Oak and the neighborhoods inside Loop 1604 are annexed San Antonio, where city inspectors sign off on heater swaps. Bulverde to the north is its own small city in Comal County, with water mostly from local systems or wells. Garden Ridge to the east has its own city permits, and Spring Branch to the northwest is unincorporated Comal County, largely on wells and septic.
Water heater questions from Timberwood Park
Who supplies water in Timberwood Park?
Most homes are on the San Antonio Water System. SAWS runs a small Trinity Aquifer well project here that supplements its main Edwards supply.
Why does my softener matter so much here?
Both Edwards and Trinity water are heavy in calcium. Without softening, tanks fill with sediment and tankless heat exchangers scale up within months.
Does the City of San Antonio inspect my water heater?
Not in unincorporated Timberwood Park. Your plumber should confirm whether a county permit applies, but the state license and code requirements still apply.
My house has two water heaters. Should I replace both?
When both tanks went in with the house and one has quit, swapping the pair in one visit usually costs less than two trips a year apart.
Can I switch from electric to gas?
Only if a CPS Energy gas main reaches your street or you add propane. Many homes in the area have neither, so a heat pump heater is often a better upgrade.
Where should the heater drain on a septic property?
Run the T&P and pan lines to daylight or a legal drain point; dumping them into the septic cleanout is a mistake. Your plumber can route them correctly.