Your water heater is one of those appliances you never think about — until it fails. And when it does, you need answers fast. Should you replace it with the same type of tank water heater? Or is it time to upgrade to tankless?
For homeowners in Arlington Heights, Wheeling, and the surrounding suburbs, this decision involves more than just price. Your home’s gas line capacity, number of bathrooms, and daily hot water usage all play a role. This guide breaks down everything you need to make the right choice.
How Traditional Tank Water Heaters Work
A tank water heater stores 40–75 gallons of hot water in an insulated tank, keeping it heated 24/7 so it’s ready when you need it. When you turn on a hot water faucet, pre-heated water flows from the top of the tank while cold water enters at the bottom to be heated.
Pros:
- Lower upfront cost ($1,200–$2,500 installed)
- Simple, proven technology that any plumber can service
- Can supply multiple fixtures simultaneously without issue (if properly sized)
- No special gas line requirements for replacement
Cons:
- Standby heat loss — you’re paying to keep water hot even when nobody’s using it
- Shorter lifespan (8–12 years typical)
- Takes up significant floor space
- Can run out of hot water during heavy use
How Tankless Water Heaters Work
A tankless (on-demand) water heater heats water only when you need it. When a hot water faucet opens, cold water flows through a heat exchanger powered by a gas burner or electric element, delivering hot water in seconds without storing it.
Pros:
- Endless hot water — it never runs out
- 20–30% more energy efficient (no standby loss)
- Longer lifespan (20+ years with maintenance)
- Compact wall-mounted design saves floor space
- May qualify for energy efficiency rebates
Cons:
- Higher upfront cost ($3,000–$5,500 installed)
- May require a gas line upgrade (common in older Arlington Heights homes)
- Flow rate limitations — running 3+ hot water fixtures simultaneously can reduce temperature
- Annual descaling needed (especially with hard water)
Cost Comparison: Tank vs. Tankless in the Chicago Suburbs (2026)
| Factor | Traditional Tank | Tankless |
|---|---|---|
| Equipment cost | $600 – $1,500 | $1,500 – $3,000 |
| Installation labor | $500 – $1,000 | $1,500 – $2,500 |
| Total installed | $1,200 – $2,500 | $3,000 – $5,500 |
| Annual energy cost | $350 – $500 | $200 – $350 |
| Lifespan | 8 – 12 years | 20+ years |
| Total cost over 20 years | $10,000 – $15,500* | $7,000 – $12,500 |
*Includes one replacement at year 10–12 for tank models.
Bottom line: Tankless costs more upfront but typically saves $3,000–$5,000 over 20 years when you factor in energy savings and the longer lifespan. For Arlington Heights and Wheeling homes planning to stay long-term, tankless usually wins on total cost of ownership.
Financing available: MMDS offers Sunbit and PowerPay financing to make the upgrade affordable. Many homeowners pay as little as $80–$120/month.
Which Type Is Right for Your Arlington Heights or Wheeling Home?
Choose a Tank Water Heater If:
- You’re on a tight budget and need a straightforward replacement
- Your home has limited gas line capacity and upgrading isn’t practical
- You plan to sell within 3–5 years (the payback period favors tankless for long-term ownership)
- You rarely use more than 2 hot water fixtures simultaneously
Choose a Tankless Water Heater If:
- You have a larger household (3+ people) and frequently run out of hot water
- Energy efficiency and lower monthly bills are a priority
- You want to free up utility room space
- Your home has adequate gas supply (or you’re willing to upgrade the gas line)
- You plan to stay in your home long-term
Special Considerations for Arlington Heights & Wheeling Homes
Hard Water
The Chicago suburbs have moderately hard water (around 8–12 grains per gallon). Both tank and tankless water heaters are affected, but tankless units are more sensitive to mineral buildup. Annual descaling is essential for tankless units here — skip it and you’ll cut the unit’s lifespan in half.
Gas Line Capacity
Many homes in Arlington Heights and Wheeling were built with 3/4″ gas lines, which are adequate for a tank water heater but may not support a high-output tankless unit. During our free estimate, we check your gas line size and meter capacity. If an upgrade is needed, we handle that too.
Venting Requirements
Tankless units require different venting than tank water heaters. Most can use PVC venting through a side wall (no chimney needed), which is actually simpler in many installations. We’ll assess your venting options during the estimate.
Permits
Both Arlington Heights and Wheeling require plumbing permits for water heater replacement. MMDS handles all permitting as part of every installation.
Top Brands We Install
MMDS installs and services all major water heater brands, including:
- Rheem: Excellent reliability, wide range of tank and tankless options
- Rinnai: Industry leader in tankless technology
- A.O. Smith: Solid tank and hybrid options, great warranty
- Navien: Premium tankless with built-in recirculation
- Bradford White: Professional-grade tank water heaters
Water Heater Maintenance Tips
For Tank Water Heaters:
- Flush the tank annually to remove sediment buildup
- Check the anode rod every 2–3 years (replace when heavily corroded)
- Test the temperature-pressure relief valve annually
- Set temperature to 120°F for safety and efficiency
For Tankless Water Heaters:
- Descale annually (or every 6 months with very hard water)
- Clean the inlet water filter every 6 months
- Check the venting system annually for blockages
- Schedule professional maintenance every 1–2 years
Frequently Asked Questions
How long does water heater installation take?
A straight tank-to-tank replacement takes 2–3 hours. Switching from tank to tankless takes 4–8 hours depending on gas line and venting work needed. Most jobs are completed in a single day.
Can I switch from electric to gas?
Yes, if your home has a gas line. This is a common upgrade in Wheeling and Arlington Heights. Running a new gas line to the water heater location adds $500–$1,500 to the project.
Is a hybrid (heat pump) water heater worth considering?
Hybrid water heaters are extremely efficient but require specific installation conditions — they need 700+ cubic feet of space around them and work best in unconditioned spaces like garages. For most Chicago-area basements, they’re not ideal. We can assess if your home is a good candidate.
What about tankless electric models?
Electric tankless units require significant electrical upgrades (often 200-amp panel + dedicated circuits) that can cost $3,000+ just for the electrical work. For most homes, gas tankless is more practical and cost-effective. If you need an electrical panel upgrade anyway, we can discuss the electric option.
My water heater is leaking — is it an emergency?
A leaking water heater should be addressed quickly. Turn off the gas/electric supply and the cold water inlet valve. If the leak is minor (dripping from the T&P valve), it may be repairable. If the tank itself is leaking, replacement is needed. Call us for same-day service.
Ready to Upgrade Your Water Heater?
Whether you choose tank or tankless, MMDS provides expert water heater installation across Arlington Heights, Wheeling, Prospect Heights, Buffalo Grove, and the surrounding area. We’ll help you choose the right system and install it properly — with permits handled and financing available.
Call (847) 221-6280 for a free estimate or schedule online.