Hot water is one of those things you never think about — until you run out of it. If your current water heater is aging or you’re planning a home renovation in the Annapolis area, you’ve likely come across one big decision: tankless or traditional? Both systems reliably deliver hot water to your home, but they do it very differently. Understanding the trade-offs can save you thousands of dollars and prevent a lot of frustration down the road.
At Heidler Plumbing, we’ve been installing and servicing water heaters in Annapolis, Arnold, Severna Park, and throughout Anne Arundel County since 1947. Over nearly 80 years, we’ve seen both technologies evolve — and we know exactly which one makes sense depending on your home’s size, usage habits, and budget. Here’s what every local homeowner should know before making the switch.
How Each System Works
Traditional (tank) water heaters store a large volume of water — typically 40 to 80 gallons — in an insulated tank and keep it heated around the clock. When you turn on a hot water tap, pre-heated water flows out and cold water refills the tank from below. They run on gas or electricity and are straightforward to install and maintain.
Tankless (on-demand) water heaters take a completely different approach. Instead of storing hot water, they heat it instantly as it flows through the unit using a high-powered gas burner or electric heating element. There’s no tank, no standing water, and no energy spent keeping water hot 24/7. When you need hot water, you get it — as long as you’re within the unit’s flow capacity.
Upfront Cost: Traditional Wins on Day One
Let’s be straightforward about price: traditional water heaters cost significantly less to purchase and install. A quality 50-gallon gas tank water heater typically runs $600–$1,200 installed. A whole-home tankless gas unit — properly sized and installed — can run $1,800–$3,500 or more, depending on whether your home needs gas line upgrades or new venting.
For homeowners in Arnold and the surrounding Anne Arundel County communities who are replacing a failed unit on a tight timeline, a traditional water heater is often the faster, more affordable path. Tankless units sometimes require additional work to bring older homes up to code — a factor worth discussing with your plumber before committing.
Energy Efficiency: Tankless Has the Long-Term Edge
Traditional water heaters lose energy constantly through what’s called “standby heat loss” — the tank radiates warmth even when no one is using hot water. This inefficiency adds up year after year on your utility bill.
Tankless heaters eliminate standby heat loss entirely. According to the U.S. Department of Energy, homes that use less than 41 gallons of hot water per day can see energy savings of 24–34% with a tankless unit compared to a traditional model. Even in larger households, the savings are typically 8–14%.
Over the lifetime of a tankless unit — which averages 15–20 years compared to 8–12 for a tank heater — those energy savings can offset the higher upfront cost. For homeowners planning to stay in their Annapolis-area home long-term, this math often tips in tankless’s favor.
Hot Water Supply: Know Your Household’s Demand
Here’s where many homeowners get tripped up. A tankless water heater provides endless hot water — within its flow rate capacity. If your household runs the dishwasher, showers, and a load of laundry simultaneously, a single tankless unit may struggle to keep up.
Traditional tank heaters work differently: you have a fixed reserve of hot water, and once it’s depleted, you wait for the tank to reheat. For a family of four, a well-sized 50-gallon tank generally handles morning demand comfortably — but back-to-back long showers can exhaust it.
The practical recommendation: Tankless units work beautifully in smaller households or homes where hot water demand is spread throughout the day. Larger families with simultaneous peak demand may need either an oversized tankless unit, two units installed in parallel, or a well-sized traditional tank. Our team can assess your home’s specific flow requirements before recommending a solution.
Anne Arundel County’s Hard Water Problem — and What It Means for Tankless
This is a consideration many homeowners overlook. Anne Arundel County and the greater Annapolis area have moderately hard water, with elevated levels of calcium and magnesium minerals. Hard water leaves scale deposits inside any water heater, but it’s a particular concern for tankless units.
In a tankless heater, water passes through narrow heat exchanger coils. Scale buildup in those coils restricts flow, reduces efficiency, and — if left unchecked — can damage the unit. Tankless manufacturers typically recommend annual flushing/descaling service in hard water areas to maintain performance and warranty coverage.
If you’re considering going tankless, pairing it with a water filtration or softening system is worth serious consideration. It protects your investment and extends the life of the unit considerably. Traditional tank heaters are also affected by hard water, but they’re generally more forgiving — scale settles to the bottom of the tank rather than clogging narrow passages.
Lifespan and Maintenance
On lifespan, tankless units have a clear advantage:
- Tankless: 15–20+ years with proper maintenance
- Traditional: 8–12 years on average
Traditional tank heaters require periodic anode rod replacement (every 3–5 years) to prevent internal corrosion, along with occasional flushing to clear sediment. They’re relatively low-maintenance, and parts are widely available and inexpensive.
Tankless units need annual descaling in our area (especially without a softener), plus periodic filter cleaning. The service visits are straightforward, but they require a qualified technician familiar with the specific brand and model. When something does go wrong, repairs on tankless units can be more expensive due to the complexity of the electronics and heat exchanger components.
Space Savings and Installation Flexibility
If space is at a premium in your home — common in older Annapolis neighborhoods and Arnold townhomes — tankless has a significant advantage. Wall-mounted and roughly the size of a large suitcase, a tankless unit takes up a fraction of the floor space of a traditional 50-gallon tank. They can be mounted in closets, on exterior walls, or in utility spaces where a tank heater simply wouldn’t fit.
However, converting from a tank to tankless system isn’t always a simple swap. Depending on your home’s current gas line size and venting configuration, modifications may be required. Our team always performs a home assessment before recommending a tankless installation to ensure there are no surprises.
Which One Is Right for Your Home?
Here’s a quick decision guide for Annapolis-area homeowners:
Consider a traditional water heater if:
- You’re replacing a failed unit and need something fast and budget-friendly
- Your household has high simultaneous hot water demand
- You prefer lower upfront cost and simpler servicing
- You plan to move within the next 5–7 years
Consider a tankless water heater if:
- You’re planning a long-term stay and want energy savings over time
- Space is limited in your utility area
- You want endless hot water without running out mid-shower
- You’re pairing it with a water softener to manage Anne Arundel County’s hard water
- You’re building or renovating and can plan the installation from the ground up
Trust Nearly 80 Years of Water Heater Experience
Heidler Plumbing has been installing, repairing, and replacing water heaters in Annapolis, Arnold, Severna Park, Edgewater, and across Anne Arundel County since 1947. We service all major brands — Rheem, Bradford White, Navien, Rinnai, A.O. Smith, and more — and our licensed plumbers can help you weigh the real costs and benefits for your specific home before you make a decision.
Whether you’re replacing a failing tank or ready to make the switch to tankless, our team will give you an honest assessment, a transparent quote, and installation you can count on for years to come. We’ve earned 8 consecutive Best Plumber awards in the Annapolis area because we treat every home like it’s our own.
Ready to talk water heaters? Learn more about our water heater installation and replacement services, or call Heidler Plumbing today at (410) 268-7191 to schedule a free in-home assessment. We serve Annapolis, Arnold, Severna Park, and the surrounding communities throughout Anne Arundel County.
