Tank & Tankless Specialists
Water Heater Services
No hot water is an emergency — especially in winter. Darwyn's Plumbing repairs, replaces, and installs all brands of tank and tankless water heaters with same-day service available across the St. Louis Metro-East area.
Water Heater Services We Provide
Water Heater Repair
No hot water, inconsistent temperatures, or strange noises? We diagnose and repair pilot light issues, thermostat failures, heating element problems, and more.
Water Heater Replacement
When repair isn't cost-effective, we replace your old unit with a properly sized, energy-efficient model. Same-day replacement available in most cases.
New Water Heater Installation
Installing a water heater in a new location? We handle gas line connections, venting, and code-compliant installation for both tank and tankless units.
Tank Flushing & Sediment Removal
Sediment buildup reduces efficiency and lifespan. Annual flushing extends your water heater's life by years and restores heating performance.
Tankless Water Heater Installation
Endless hot water and up to 30% better energy efficiency. We install and service on-demand tankless systems from Rinnai, Navien, and other top brands.
Anode Rod Replacement
The anode rod prevents tank corrosion. We inspect and replace sacrificial rods during maintenance to maximize tank lifespan — often overlooked but critical.
Tank vs. Tankless Water Heaters
🛢️ Traditional Tank Water Heater
- •Lower upfront cost — $300–$700 installed
- •Simple to repair and maintain
- •Works with most existing gas/electric setups
- •Capacity: 40–80 gallons
- •Lifespan: 8–12 years
- •Standby heat loss between uses
- •Best for: Most households, budget-conscious buyers
⚡ Tankless Water Heater
- •Higher upfront cost — $800–$2,000 installed
- •Up to 30% more energy-efficient
- •Endless hot water — heats on demand
- •Compact wall-mounted unit saves space
- •Lifespan: 15–25 years
- •Requires proper gas line sizing
- •Best for: Large families, energy-conscious buyers
Not sure which is right for your home? Call us — we'll give you an honest recommendation based on your usage and budget.
Signs Your Water Heater Needs Attention
No hot water or runs out quickly
Heating element, thermostat, or pilot failure
Rusty or discolored water
Sediment buildup or internal corrosion — possible replacement needed
Popping or rumbling sounds
Sediment hardened on heating element — flush required
Water pooling around tank
Pressure relief valve failure or tank corrosion — call immediately
Unit is 10+ years old
Schedule inspection — replacement may be more cost-effective than repairs
Pilot light won't stay lit
Thermocouple failure or gas supply issue
Water Heater Problem? Call Now.
Same-day water heater repair and replacement across the St. Louis Metro-East area.
Call (618) 337-9322