Spa Fitter
Canadian Spa Company Thunder Bay SE Replacement Cover
The Canadian Spa Company Thunder Bay SE takes the AIRCAP 1™ Medium — a foam-free replacement hot tub cover for square spas 86"–88". The Thunder Bay SE's cabinet measures 86" x 86", inside the Medium's range. The cover weighs 35–40 lb for life, costs $1,195, is engineered to comply with ASTM F1346-23, and carries a 3-year limited warranty.
| Spa cabinet | 86" x 86" |
|---|---|
| AIRCAP 1™ size | Medium fits 86"–88" |
| Cover weight | 35–40 lb — constant for life |
| Price | $1,195, free US shipping |
| Skirt | Ziptech™ modular, three lengths included |
| Safety | Engineered to comply with ASTM F1346-23 |
| Warranty | 3-year limited warranty |
Why the Medium fits the Thunder Bay SE
The AIRCAP 1™ comes in six sizes covering square spas from 77" to 94". Each size is built to overhang its band slightly — that is how a spa cover is meant to sit — so the Medium, which fits cabinets 86"–88", covers the Thunder Bay SE's 86" x 86" shell with the right overhang.
At 86" the Thunder Bay SE sits at the bottom of the Medium's 86"–88" range, so there is room to spare: the same cover fits anything up to 88". Within Canadian Spa Company, the Thunder Bay SE shares that 86" x 86" cabinet with Victoria — same footprint, same cover. The 17 Canadian Spa Company models we fit sit on 5 footprints, and the Thunder Bay SE is on number 4 of 5 from the smallest; together they span 4 of the six AIRCAP 1 sizes.
Cabinet dimensions can change between model years. Before ordering, measure your Thunder Bay SE at its widest point across the top, in both directions, including any acrylic lip that overhangs the cabinet — the SureFit™ guide walks through it in two measurements. If a figure you have found elsewhere is larger than ours, an overhanging lip is the usual reason. If your spa measures between two sizes, round up.
Every spa in our catalogue that measures 86" x 86" is on one page: hot tubs that take an 86" × 86" cover — the same AIRCAP 1™ Medium, at the same price.
How the AIRCAP 1™ is built
Instead of a rigid foam core wrapped in vinyl, the AIRCAP 1™ uses welded drop-stitch construction: a sealed air chamber with no foam to absorb water, so it does not become the waterlogged two-person lift that ends most foam covers. More on how it insulates, how it holds up, and why it is foam-free — or estimate what your current foam cover weighs.
Every Canadian Spa Company model we fit
| Model | Cabinet | AIRCAP 1™ |
|---|---|---|
| Cambridge | 79" x 79" | XX-Small |
| Cornwall | 78" x 78" | XX-Small |
| Montreal SE (2016–2018) | 79" x 79" | XX-Small |
| Richmond | 79" x 79" | XX-Small |
| Winnipeg (2012–2024) | 79" x 79" | XX-Small |
| Burnaby SE | 84" x 84" | Small |
| Edmonton | 84" x 84" | Small |
| Erie SE GL (Great Lakes) | 84" x 84" | Small |
| Huron GL (Great Lakes) | 84" x 84" | Small |
| London SE | 84" x 84" | Small |
| Michigan (Great Lakes) | 84" x 84" | Small |
| St. Clair (Great Lakes) | 84" x 84" | Small |
| Toronto SE | 84" x 84" | Small |
| Thunder Bay SE (this page) | 86" x 86" | Medium |
| Victoria | 86" x 86" | Medium same cover as the Thunder Bay SE |
| Niagara Falls | 90" x 90" | Large |
| Superior (Great Lakes) | 90" x 90" | Large |
Canadian Spa Company Thunder Bay SE cover: common questions
What size hot tub cover fits the Canadian Spa Company Thunder Bay SE?
The Canadian Spa Company Thunder Bay SE takes the AIRCAP 1 Medium, which fits square hot tubs measuring 86"–88" across. The Thunder Bay SE's cabinet measures 86" x 86", inside that band. Measure your spa side to side across the top of the cabinet to confirm before ordering.
Will the AIRCAP 1 fit a Canadian Spa Company Thunder Bay SE?
Yes — the Thunder Bay SE's 86" x 86" square cabinet falls in the AIRCAP 1 Medium's 86"–88" range, and the Ziptech modular skirt system ships with three skirt lengths so the drop over the cabinet adjusts without a custom order. Cabinet sizes can change between model years, so confirm with two quick measurements.
How much does a replacement cover for the Canadian Spa Company Thunder Bay SE cost?
The AIRCAP 1 costs $1,195 in every size, including the pump, three Ziptech skirt lengths, and tie-down straps, with free US shipping and 30-day returns. Unlike a foam cover it has no foam core to waterlog, so it stays at its original 35–40 lb weight for life.
How heavy is a replacement cover for the Canadian Spa Company Thunder Bay SE?
The AIRCAP 1 Medium weighs 35–40 lb and keeps that weight permanently — its sealed drop-stitch air core cannot absorb water. A foam cover starts at 40–75 lb and gains weight as the foam saturates.
Not a Thunder Bay SE?
The Spa Fitter matches the current models of every major brand to the right AIRCAP 1™ — or measure any square spa with SureFit™.