New water heaters generally do not need insulation blankets, as they are often designed with built-in insulation to enhance energy efficiency.
Water heater insulation blankets were once a standard energy-saving upgrade, but modern units often have built-in insulation. Here’s how to determine if your heater needs extra insulation and how to install it safely.
When to Insulate Your Water Heater
Newer water heaters with high R-values (typically R-16 to R-24) may not benefit from additional insulation. Check your unit’s specifications:
- Electric heaters with R-values below 24 often benefit from blankets
- Gas heaters lose most heat through the flue – blankets provide minimal benefit
- Tankless units don’t need insulation blankets
The U.S. Department of Energy notes insulation can reduce standby heat losses by 25-45%, saving 7-16% on water heating costs.
How to Check Your Heater’s Insulation
- Locate the R-value on the manufacturer’s label
- Feel the tank – if it’s warm, it’s losing heat
- Check local codes – some prohibit insulation blankets
Installation Safety Considerations
Improper installation can create hazards. Never cover:
| Component | Risk |
|---|---|
| Safety warnings | Hidden hazards |
| Access panels | Prevents maintenance |
| Ventilation areas | Combustion issues |
For gas units, maintain at least 6 inches clearance around the flue and draft hood. Electric heaters need access to both thermostats and heating elements.
Step-by-Step Installation
Materials Needed:
- Pre-cut insulation blanket ($20-$30)
- Dust mask and gloves
- Electrical tape
- Scissors/utility knife
- Marker
Installation Steps:
- Turn off power (breaker for electric, gas valve to pilot for gas)
- Measure and cut blanket to height
- Wrap blanket, avoiding access panels
- Mark control locations
- Cut openings for controls and pipes
- Secure with tape (don’t use adhesive)
Alternative Efficiency Improvements
Instead of insulation, consider these upgrades:
- Programmable thermostats (set to 120°F)
- Tankless conversion for long-term savings
- Pipe insulation for first 3-6 feet of hot water lines
- Annual flushing to remove sediment
According to Newcomb and Company, proper maintenance combined with insulation can extend heater life by several years.
When to Skip the Blanket
Avoid insulation if:
- Your heater is less than 5 years old
- R-value exceeds 24
- You have a tankless or heat pump water heater
- Local codes prohibit blankets
- The unit is in a conditioned space
Modern units like the Suburban SW6DEL feature advanced insulation that makes blankets unnecessary.
