Best Whole-House Surge Protectors (2026)

Most people picture a surge as a lightning strike, and in South Florida that picture is fair: the state averages around 1.4 million lightning strikes a year, according to the Florida Division of Emergency Management. But most surges are smaller and far more frequent. Utility switching, grid faults, storm damage to lines, and large motors in the house cycling on and off all push short voltage spikes onto the wiring. Each one does a little damage to the electronics inside air handlers, pool pumps, refrigerators, televisions and routers.

A whole-house surge protector, properly called a surge protective device or SPD, sits at the electrical panel and diverts those spikes before they reach the branch circuits. This list compares panel-mounted SPDs that the manufacturers currently sell for homes, explains what the ratings on the box mean, and covers what South Florida owners should ask an electrician. It is not a ranking of contractors; for that, see our list of the best electrical contractors in South Florida.

How we picked

Every device below is listed on its manufacturer's website or spec sheet as a current product for 120/240V single-phase homes, and is listed to UL 1449, the safety standard for surge protective devices. Where a model we first considered had been discontinued, we used the maker's named replacement instead. We compared:

• SPD Type. Type 1 devices may be installed on the line side of the main breaker, including outdoors at the meter. Type 2 devices go on the load side, inside or next to the panel, on a breaker.
• Surge current (kA). The largest single surge the device is built to handle, usually given per phase. Higher numbers generally mean more headroom and longer life under repeated hits.
• Nominal discharge current (In). A UL 1449 test rating for how the device holds up under repeated surges. Higher is better, and 20kA is the figure premium residential devices list.
• Enclosure. NEMA 4X or 3R housings can go outdoors; NEMA 1 is indoor only.
• Status indication. Every good SPD has a light, and some add an audible alarm, to show when its protection has been used up.

We left out prices and connected-equipment coverage offers. Those change often, and they should not be the reason to pick one device over another.

1. Eaton CHSPT2ULTRA

Eaton's CHSPT2ULTRA is a Type 2 service-entrance SPD for 120/240V homes. Eaton lists a 108kA surge current rating and a 20kA nominal discharge current, four modes of protection, and a nonmetallic NEMA 4 enclosure, so it can be mounted beside the panel indoors or out. As a Type 2 device it is fed from a two-pole breaker in the panel.

Best for: a strong general-purpose choice when the panel has two spaces free.
Worth knowing: it needs its own breaker, so a full panel may need rearranging first.

2. Siemens FirstSurge Pro FS140

Siemens' FS140 is a Type 2 SPD rated for split-phase services up to 400A, with a surge capacity of 140kA. Siemens lists a NEMA 4X indoor-outdoor enclosure, LED status lights, an audible alarm and what it calls ground reference monitoring, which alerts the owner if it detects a problem with the neutral-to-ground connection in the electrical system. Siemens says it installs onto any brand of load center.

Best for: large homes with 320A or 400A services, and owners who want an alarm, not only a light.
Worth knowing: it mounts through a knockout with a chase nipple, so position on the panel matters.

3. Square D HEPD80

Schneider Electric's Square D HEPD80 (sold as part of its SurgeArrest whole home range) is a Type 1 SPD with 80kA of surge protection per phase, in a compact NEMA 4X nonmetallic housing. Because it is Type 1 it can be installed on the line side of the main breaker, including outdoors, as well as at the load center.

Best for: installations where the device needs to go at the meter or outside, or where Type 1 placement is preferred.
Worth knowing: its surge rating is lower than the largest devices here; on a lightning-exposed lot, some owners pair it with point-of-use protection at sensitive equipment.

4. Leviton P2120-B

Leviton's P Series P2120-B is a Type 1 panel-mount SPD for 120/240V split-phase service. Leviton lists 50kA per mode, a 20kA nominal discharge rating, a 200kA short circuit current rating, a NEMA 4X polycarbonate enclosure and thermally protected components, plus dry contacts for remote monitoring. It replaces Leviton's older 51120-1 panel protector, which Leviton now lists as discontinued.

Best for: owners who want Type 1 flexibility and the option to wire the status into a monitoring system.
Worth knowing: if a product listing still shows the 51120-1, it is the older model.

5. Intermatic IG1240RC3

Intermatic's IG1240RC3 is rated for either Type 1 or Type 2 use on 120/240V single-phase service, with six modes of protection and thermally protected metal oxide varistor technology. It comes in an outdoor plastic housing, and Intermatic notes it can protect automatic transfer switches as well as panels, which makes it a practical match for homes with a standby generator.

Best for: homes with a generator transfer switch, and installers who want one device approved for both Type 1 and Type 2 locations.
Worth knowing: a status light is the only indicator, so it needs an occasional look.

6. Square D QO2175SB SurgeBreaker

For homes with a Square D QO load center, the QO2175SB plugs into two breaker spaces like a breaker, so there is no separate box on the wall. Square D lists it as a UL 1449 Type 2 SPD with a 25,000 amp maximum surge capacity.

Best for: tidy installs in QO panels that have two spaces free.
Worth knowing: it only fits Square D QO load centers, and its surge rating is modest; consider it the minimum layer rather than the whole plan.

Comparison at a glance

What the code requires

Since the 2020 edition of the National Electrical Code, section 230.67 requires every service supplying a dwelling unit to have a Type 1 or Type 2 surge protective device, installed as part of the service equipment or immediately next to it, and the rule applies again whenever service equipment is replaced (summary of NEC 230.67). Florida adopted NEC 2020 for electrical work in the Florida Building Code, 8th Edition, effective December 31, 2023 (Florida Building Commission). In practice that means a new service or a panel upgrade in Florida should include an SPD, and an older home can have one added at any time.

Why South Florida homes benefit more than most

Lightning and storms

Frequent summer thunderstorms mean more nearby strikes and more utility faults. No device survives a direct strike to the house, but a panel SPD handles the far more common induced surges that come in on the service and the ones created when storm-damaged lines are switched back on.

Expensive electronics in everything

Variable-speed air handlers, pool pumps, smart appliances and EV chargers all run on circuit boards. Those boards are the parts most sensitive to repeated small surges, and they are the parts that are hardest to source quickly after a storm.

Generators and transfer switches

If the home has a standby generator, the transfer switch is another point where surges can enter, and the generator's own controller is sensitive equipment. Plan surge protection with the generator, not as an afterthought. Our guide to the best whole-home generators for hurricane season covers the generator side.

Grounding matters as much as the device

An SPD diverts surge current to ground, so it can only work as well as the grounding system behind it. Short, straight leads and a sound grounding electrode system make a real difference. An electrician should check both at installation rather than simply adding a device to the panel.

Frequently asked questions

Do I still need plug-in surge strips?

Yes, for sensitive equipment. A whole-house SPD handles surges arriving on the service; a point-of-use protector at the TV, computer or network equipment is a second layer that catches what gets past and surges generated inside the house.

Which is better, Type 1 or Type 2?

Both satisfy the code requirement for dwellings. Type 1 devices can go on the line side, including at the meter, which is useful when the panel is full or indoors. Type 2 devices go on a breaker at the panel. The right choice depends on your equipment and layout more than the label.

How do I know when a surge protector is worn out?

Check the status light, and the alarm if the device has one. SPDs wear with each surge they absorb; when the light shows a fault, the device needs replacing. It is worth looking after every major storm.

Can I install a whole-house surge protector myself?

It is work inside a live panel, so it should be done by a licensed electrician. A permit may be required depending on the jurisdiction and scope, particularly when it is part of a service change.

Next steps

The best device is the one installed correctly, on a sound grounding system, with the right Type for your panel. KRW Electric installs surge protection at the panel and, where it is warranted, at specific equipment, and checks the grounding the protection depends on. See surge protection for how we approach it, panel upgrades if your service needs replacing anyway, or get in touch to talk about your home. Looking for help with the panel itself? See the best panel upgrade electricians in South Florida.

Reviewed by Kyle White, KRW Electric Company LLC — licensed electrical contractor EC13012832.