Choose seismic water-heater straps as a complete restraint system matched to the tank and its anchorage. A gallon rating is only one check. The wall connection, required clearances, strap arrangement and exact kit contents must also fit the installation.
This is a selection and quote-checking guide based on published documents, not a tested product ranking or drilling tutorial. Our water-heater replacement guide covers the wider replacement job.
Restraint straps and expansion-tank brackets do different jobs
Washington Geological Survey’s homeowner earthquake guide, page 14 (dnr.wa.gov), explains that an unsecured water heater can topple and break water or gas lines. It illustrates upper and lower bracing connected to wall studs and warns against substituting plumber’s tape. The booklet expressly says it is not a how-to guide; its illustration is not a design for every wall and heater.
Check the product’s intended job before comparing its dimensions. HoldRite’s U.S. restraint category (holdrite.com) separates water-heater restraints from expansion-tank supports. A bracket for a small expansion tank is not automatically a seismic restraint for the main storage heater, even if a search listing mentions both.
The model number is not the gallon rating
HoldRite’s current U.S. steel-restraint table (holdrite.com) lists these two Quick Strap examples. They illustrate how to read a specification, rather than establish a best choice for your home.
| Model | Published capacity and strap dimensions |
|---|---|
| QS-50 | Water heaters up to 80 U.S. gallons; 38 × 1½ inch straps |
| QS-120 | Water heaters up to 120 U.S. gallons; 54 × 1½ inch straps |
QS-50 therefore does not mean “50 gallons only.” Conversely, a rating covering your heater’s capacity does not prove the supplied straps and fasteners suit its location. Compare the heater model, actual tank dimensions, wall position and complete manufacturer arrangement. Strap length is not a stated maximum tank circumference: the straps must also reach their anchorage and connect as designed.
Check what the straps connect to
HoldRite’s linked Quick Strap instruction guide, English section (holdrite.com), shows attachment to wood wall studs. A concrete wall, metal framing or a location without suitable nearby framing needs its own confirmed anchorage solution. Do not substitute a drywall fixing simply because it passes through a hole in the strap.
Have the installer check the restraint layout against the exact heater’s controls and clearance requirements. The Quick Strap guide specifies upper and lower placement and clearance above the controls; it also discusses a spacer when wall clearance is required. Those are related checks, not permission to pull every heater flush against a wall. Keep the heater’s own installation instructions part of the review.
The kit guide warns that wall coverings can conceal pipes or electrical wiring and calls for qualified help when interference cannot be ruled out. This is a reason to settle the anchorage plan before fastening, rather than buying a longer strap and improvising the attachment.
Resolve the box contents before the job starts
Read the parts list for the exact package. The QS-50 Rev I specification (holdrite.com) lists four straps and two J-clips, while the linked instruction guide lists four straps and four J-clips. The QS-120 Rev M specification (holdrite.com) lists four of each. Confirm the current QS-50 package and required hardware with HoldRite; do not resolve that document difference by omitting parts or borrowing another model’s list.
Also distinguish individual strap pieces from completed restraints: the instruction sequence joins a pair, then repeats for a second pair. A “four straps” contents line is not a universal requirement for four separate bands around the tank.
For an itemized quote, request the restraint model, complete hardware, proposed anchorage, any clearance work and applicable inspection scope. Our water-heater replacement cost guide explains why comparing the same scope matters. Confirm local requirements with the installer and building official; a listing or approval logo does not certify the finished installation.