Bullfrog A7 vs M7 hot tubs compared
Short answer
The Bullfrog A7 seats 8 with no lounger in 88 x 88 in; the M7 seats 9 with 2 loungers in 91 x 91 in. The A7 is $12,095–$26,395 (maker's A Series starting prices, Oct 2026); the M7 $24,695–$30,395 (maker's M Series starting prices, Oct 2026).
| Measure |  Bullfrog A7A Series |  M7M Series |
|---|---|---|
| Lineup | ||
| Series | A Series | M Series |
| Priceas labeled under each figure | $12,095–$26,395A Series starting prices (MSRP), Oct 2026 | $24,695–$30,395M Series starting prices (MSRP), Oct 2026 |
| Size | ||
| Seats | 8 | 9 |
| Loungers | Not published | 2 |
| Length | 88" | 91" |
| Width | 88" | 91" |
| Height | 36" | 37" |
| Water | 528 gal1,999 L as published | 453 gal |
| Dry weight | 936 lb | 900 lb |
| Filled weightwater, no people | 5,349 lb | 5,929 lb |
| Jets and pumps | ||
| Jetsas the maker counts them | 196–234 | 270 |
| Jet pumps | 2 | 2 |
| Pump horsepoweras published | 2.5 HP per pump | Not published |
| Neck and shoulder jets | available via NeckEase NX and NeckPlus NX JetPaks®… | Not published |
| Electrical | ||
| Voltage | 240V | 240V (US/CAN); 230V or 400V export |
| Amperage | Not published | 240 VAC, 60 Hz, 30 A or 50 A |
| Breaker | 50 | Not published |
| 120V plug-in | factory-order option only (not a field conversion) | Not published |
| Heaterat 240V | 4 kW | Not published |
| Build and water care | ||
| Insulation | full foam, 100% closed-cell | Standard |
| Shell | acrylic | acrylic |
| Ozone | WellSpring™ Ozone System (O3) with an ozone jet | Standard |
| Salt system | not offered | Not published |
| Warranty | ||
| Shell structure | 10 years | 10 years |
| Shell surface | 7 years | 7 years |
| Equipment | 5 years | 5 years |
| Plumbing | 5 years | 5 years |
| Cabinet | 5 years | 5 years |
Verdict: The Bullfrog A7 suits buyers who want open seating with no lounger, a smaller footprint (88 x 88 in) and a lighter load on a deck (5,349 lb filled). The M7 suits buyers who want room for 9, a lounger and a roomier shell (91 x 91 in).
No manufacturer pays us. How we make money
What is the difference between the Bullfrog A7 and M7?
The A7 seats 8 and the M7 9, and only the M7 has a lounger. The A7 measures 88 x 88 x 36 in and the M7 91 x 91 x 37 in. Prices: the A7 $12,095–$26,395 (maker's A Series starting prices, Oct 2026), the M7 $24,695–$30,395 (maker's M Series starting prices, Oct 2026).
Both are Bullfrog Spas hot tubs, the A7 from the A Series and the M7 from the M Series. Every figure is the maker's own, with a dot that links the page or PDF it came from. Where the published specs differ:
- Seats. A7: 8; M7: 9
- Length. A7: 88"; M7: 91"
- Width. A7: 88"; M7: 91"
- Height. A7: 36"; M7: 37"
- Water. A7: 528 gal; M7: 453 gal
- Dry weight. A7: 936 lb; M7: 900 lb
- Filled weight. A7: 5,349 lb; M7: 5,929 lb
- Jets. A7: 196–234; M7: 270
- Voltage. A7: 240V; M7: 240V (US/CAN); 230V or 400V export
- Insulation. A7: full foam, 100% closed-cell; M7: Standard
- Ozone. A7: WellSpring™ Ozone System (O3) with an ozone jet; M7: Standard
Will the A7 or the M7 fit my space and deck?
The A7 is 88 x 88 in, about 54 sq ft and 36 in tall; filled, it weighs 5,349 lb, about 99 lb per sq ft before anyone gets in. The M7 is 91 x 91 in, about 58 sq ft and 37 in tall; filled, it weighs 5,929 lb, about 103 lb per sq ft before anyone gets in. Leave room around the tub for the cover lifter and the service panel, and have a builder check any deck for the filled weight plus people. See hot tub sizes, hot tub weight and what to put a hot tub on.
What electrical hookup do the A7 and M7 need?
The A7 runs on 240V with a 50 A breaker. The M7 runs on 240V (US/CAN); 230V or 400V export. The table lists amperage and breaker as each maker prints them. A licensed electrician sizes the circuit and the GFCI protection for the model you buy. See hot tub electrical requirements.
Do the A7 and M7 carry the same warranty?
Bullfrog A7: 10 years on the shell structure, 7 years on the shell surface, 5 years on the equipment, 5 years on the plumbing and 5 years on the cabinet.
Bullfrog M7: 10 years on the shell structure, 7 years on the shell surface, 5 years on the equipment, 5 years on the plumbing and 5 years on the cabinet.
Read the warranty card before you sign: labor after year one, travel charges, and whether coverage moves to a second owner. The hot tub warranty comparison lines up every brand.
What do the A7 and M7 sell for?
Bullfrog Spas posts only a series range for the A7: $12,095–$26,395 (maker's A Series starting prices, Oct 2026). Bullfrog Spas posts only a series range for the M7: $24,695–$30,395 (maker's M Series starting prices, Oct 2026). Delivery, the pad, the electrician and the cover lifter are extra. Each model's price and where it comes from: Bullfrog A7 price and Bullfrog M7 price.
Which costs less to run, the A7 or the M7?
The A7, by 18 W on standby, about $2.39 a month. Standby is what a tub draws to hold its temperature with the cover on and nobody in it. California tests it the same way for every spa sold in the state, so it is the fairest running-cost figure we have.
The A7 draws 233 W in California's standby test (filed at 418 gallons), about 170 kWh and $30.94 a month at the U.S. average rate. 33% of the 100 filed tubs its size draw more; their median is 222.5 W.
The M7 draws 251 W in California's standby test (filed at 453 gallons), about 183 kWh and $33.33 a month at the U.S. average rate. 19% of the 90 filed tubs its size draw more; their median is 223 W.
Costs use the U.S. average residential rate of 18.19¢ a kWh (January to July 2026, EIA). Your own rate, climate and how often you use the jets change the bill. Hot tub running cost works it out by state, and measured standby watts lists every filed model.
What to check in the showroom
- Sit in both, dry is fine, in the seat you would use most. On a running display tub, feel the jets with the back of your hand. Seat depth and where the jets land matter more than the count.
- Climb in and out: step height and the lounger's length suit some bodies and not others.
- Ask for each model's California Energy Commission listing and the warranty card.
- Lie back in the lounger, dry is fine. If your feet don't reach the end of the footwell or your head sits low, it will not suit you.
The full spec sheets: Bullfrog A7 hot tub and Bullfrog M7 hot tub. The series: Bullfrog A Series.
Other model comparisons: Bullfrog A7 vs A8, Bullfrog A7 vs X7, Bullfrog A7 vs A7L and Bullfrog A6 vs A7.
Still deciding? Get the price range on both.
- Bullfrog A7$12,095–$26,395A Series starting prices (MSRP)
- Bullfrog M7$24,695–$30,395M Series starting prices (MSRP)
Free price range, then one dealer.
Common questions
What is the difference between the Bullfrog A7 and M7?
The A7 seats 8 and the M7 9, and only the M7 has a lounger. The A7 measures 88 x 88 x 36 in and the M7 91 x 91 x 37 in. Prices: the A7 $12,095–$26,395 (maker's A Series starting prices, Oct 2026), the M7 $24,695–$30,395 (maker's M Series starting prices, Oct 2026). The table lists every published figure side by side.
Which is bigger, the A7 or the M7?
The M7: 91 x 91 in, about 58 sq ft, against 88 x 88 in, about 54 sq ft for the A7.
Which costs less to run, the A7 or the M7?
The A7: 233 W on standby against 251 W in California's tests, about $30.94 against $33.33 a month at the U.S. average of 18.19¢ a kWh (EIA, January to July 2026). Heating fresh water and running the jets add to that.
Do the A7 and M7 have the same warranty?
Yes, on the terms the maker publishes: shell structure 10 years, shell surface 7 years, equipment 5 years, plumbing 5 years and cabinet 5 years.
How much do the A7 and M7 cost?
Bullfrog Spas posts only a series range for the A7: $12,095–$26,395 (maker's A Series starting prices, Oct 2026). Bullfrog Spas posts only a series range for the M7: $24,695–$30,395 (maker's M Series starting prices, Oct 2026). Delivery, the pad and the electrician are extra.
Sources
7
- Bullfrog Spas A7 product pagemaker's specifications
- Bullfrog Spas A7 specification sourcesize, jets and electrical
- Bullfrog Spas A7 specification sourcesize, jets and electrical
- Bullfrog Spas warrantyA7 warranty terms
- Bullfrog Spas M7 product pagemaker's specifications
- California Energy Commission appliance database (spas)standby watts
- EIA Electric Power Monthly, Table 5.6.BU.S. average residential rate, 18.19¢ a kWh, January to July 2026