Sennen 300 Sauna Pod Thermo
Curved comfort for six close friends
About
More room under the same distinctive arch. Sauna Pod Sennen 300 extends to 300 x 240cm, the extra length giving comfortable group seating rather than squeezing in one or two people. Tempered glass door withstands the same thermal stress as the smaller version. Built for households who want family or friends joining a session together, not taking turns one at a time.
Specification
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Shape:
Arched
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Accommodates:
5-6 People
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Footprint:
300 x 240 cm
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Max Height:
232 cm
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Wall Thickness:
42 mm
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Material:
Thermowood
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Glass Door:
180 x 59 cm
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Window:
67 x 30 cm
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Glazing:
Tempered Glass Door
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Weight:
900 kg
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Package Size:
300 x 120 x 120 cm
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Assembly:
Self-assembly
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Insulated:
No
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Design Note:
Glass door; built-in changing area
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Power Supply:
Single or Three Phase
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Heater Compatibility:
Electric & Wood-Fired
Designed around your ritual
Full Glass Back Window
Half Moon Back Window
Full Glass Front Barrel
Full Glass Front Cube
LED Lighting Kits
Bluetooth Speakers
Quality Accessories
Premium Thermowood
Frequently Asked Questions
2-Year Guarantee
Built for years of wellness and relaxation
Free UK Mainland Delivery
Delivery throughout England, Wales, and Scotland.
Expert Help, When You Need It
Friendly specialist support before and after your purchase. Book a free consultation.
Delivered flat-packed for self-assembly, with free UK mainland delivery on qualifying orders. Allow a full weekend for assembly and have at least one other capable adult available to help. Larger, heavier and multiroom models may require additional time and lifting assistance. A solid, level base and suitable delivery access are required.
For a complete setup, select Professional Installation and choose your preferred date, allowing for the stated production lead time. We’ll then arrange the installation around your requirements, including any additional preparation or works needed to accommodate your sauna where possible. Worth running our sauna build checker before delivery day, and our heater size calculator to confirm the heater this one needs.
Inside, this sauna holds about 7.7 m³ of air, about the size of a small box room. To get that properly hot you want roughly 6kW of heat, and the Saunum Experience 6kW (Leil 1.1) is the one we'd point you at. Anything between 6kW and 9kW will do the job, so it comes down to how it looks, how you control it and what you want to spend. Our heater size calculator shows how we got to that and lists every heater that fits this model.
A heater this size runs off a normal household supply, but it can't go in a plug socket. It needs its own dedicated circuit, much like an electric shower or oven. Whichever heater you pick, check what it needs before you buy.
The heater gets wired straight into your electrics by a qualified electrician. Never a plug, never an extension lead. If you're near us in Leicestershire we can arrange the electrician for you for a fee, so it's all done in one go. There's more detail in our full guide to electric heater setup.
Two things worth doing before you buy: our running cost calculator tells you what a session will cost to heat, and our solar calculator works out the panels and battery you'd need if you'd rather run it from the sun.
Inside, this sauna holds about 7.7 m³ of air, about the size of a small box room. The Cozy 12 OG Wood Burning Heater is the stove we'd suggest for it, and anything from the 12kW to the 16kW will work. Our heater size calculator shows how we worked that out and what else fits.
A wood stove needs no electrics at all, but it does get extremely hot. It has to sit a set distance from the timber walls and benches, usually with a heat shield behind it, and something fireproof underneath in case an ember drops out. The stove instructions give you the exact distances. The walls are 42mm solid timber with no insulation layer, so it takes a bit longer to warm up and uses a bit more wood than an insulated one.
The chimney runs up and out through the roof. This one has a curved roof, so the collar needs to match that shape and be sealed well against standing water. The fire also needs air to burn, and the room needs a vent low down and another high up so fresh air comes in and damp gets out. Have a think about where the smoke will blow, in relation to your house, your neighbours and where you sit outside.
Before you build, run our sauna build checker. It checks your vents, bench heights, clearances and drainage in a couple of minutes and flags anything that'll cause you grief later. Our full guide to wood-fired heater setup covers the rest. It's also worth a quick check with your council, as some areas have rules about chimneys and smoke.
The larger Sauna Pod Sennen 300 follows identical care principles to the smaller Sauna Pod Sennen, simply applied across more surface area. After every session, leave the door open for twenty to thirty minutes to let the heat room dry out fully, preventing mould and dark staining over time. Wipe benches down once cooled, and sand the interior lightly once or twice a year wherever group use creates the most contact wear.
The tempered glass door and window need only a standard glass cleaner and soft cloth. The built-in changing area should be checked periodically for dampness, particularly given the higher likelihood of more frequent group use putting more towels and robes through the space.
Externally, treat the Thermowood exterior with a wood treatment every two to three years, budgeting more time for this larger structure than the smaller Sauna Pod Sennen would need. The arched roofline sheds water differently to a flat roof, so check drainage along the curve and base periodically, particularly after stormy weather or heavy autumn leaf fall, ensuring nothing pools against the lowest timber courses.
Production takes 10-12 weeks, plus 1-2 weeks dispatch time for haulage. Due to its size and weight, this sauna ships on an oversized pallet (typically around a tonne or more) and arrives kerbside on a flatbed truck. Free UK mainland shipping applies, but additional charges may apply by postcode for length, weight, or restricted access, quoted separately.
Because of its size and weight, this item cannot be unloaded by tail lift and unloading is not included in the price — it needs arranging in advance. Depending on your access, you have three options:
- Forklift – if there's space to move the pallet from the truck to its final position, this is the most cost-effective choice.
- HIAB – for lifting over a fence or wall near the road, a HIAB (truck-mounted crane) is a practical and affordable option.
- Crane – if the final position is far from the road and forklift access isn't possible, a crane will be needed.
Handballing is possible but requires a full team of able helpers and suitable lifting equipment at every stage, and is done at your own risk. We can help source a forklift, HIAB, or crane in your area for an additional fee — if you're unsure which suits your site, contact us before ordering and we'll advise. Please have a solid, level base and clear access ready before delivery. Final positioning is not included unless you use our installation team; once unloaded, moving and positioning the goods is your responsibility.
Assembly & Installation
Delivered flat-packed for self-assembly, with free UK mainland delivery on qualifying orders. Allow a full weekend for assembly and have at least one other capable adult available to help. Larger, heavier and multiroom models may require additional time and lifting assistance. A solid, level base and suitable delivery access are required.
For a complete setup, select Professional Installation and choose your preferred date, allowing for the stated production lead time. We’ll then arrange the installation around your requirements, including any additional preparation or works needed to accommodate your sauna where possible. Worth running our sauna build checker before delivery day, and our heater size calculator to confirm the heater this one needs.
Electric Heater Setup
Inside, this sauna holds about 7.7 m³ of air, about the size of a small box room. To get that properly hot you want roughly 6kW of heat, and the Saunum Experience 6kW (Leil 1.1) is the one we'd point you at. Anything between 6kW and 9kW will do the job, so it comes down to how it looks, how you control it and what you want to spend. Our heater size calculator shows how we got to that and lists every heater that fits this model.
A heater this size runs off a normal household supply, but it can't go in a plug socket. It needs its own dedicated circuit, much like an electric shower or oven. Whichever heater you pick, check what it needs before you buy.
The heater gets wired straight into your electrics by a qualified electrician. Never a plug, never an extension lead. If you're near us in Leicestershire we can arrange the electrician for you for a fee, so it's all done in one go. There's more detail in our full guide to electric heater setup.
Two things worth doing before you buy: our running cost calculator tells you what a session will cost to heat, and our solar calculator works out the panels and battery you'd need if you'd rather run it from the sun.
Wood-Fired Heater Setup
Inside, this sauna holds about 7.7 m³ of air, about the size of a small box room. The Cozy 12 OG Wood Burning Heater is the stove we'd suggest for it, and anything from the 12kW to the 16kW will work. Our heater size calculator shows how we worked that out and what else fits.
A wood stove needs no electrics at all, but it does get extremely hot. It has to sit a set distance from the timber walls and benches, usually with a heat shield behind it, and something fireproof underneath in case an ember drops out. The stove instructions give you the exact distances. The walls are 42mm solid timber with no insulation layer, so it takes a bit longer to warm up and uses a bit more wood than an insulated one.
The chimney runs up and out through the roof. This one has a curved roof, so the collar needs to match that shape and be sealed well against standing water. The fire also needs air to burn, and the room needs a vent low down and another high up so fresh air comes in and damp gets out. Have a think about where the smoke will blow, in relation to your house, your neighbours and where you sit outside.
Before you build, run our sauna build checker. It checks your vents, bench heights, clearances and drainage in a couple of minutes and flags anything that'll cause you grief later. Our full guide to wood-fired heater setup covers the rest. It's also worth a quick check with your council, as some areas have rules about chimneys and smoke.
Cleaning & Care
The larger Sauna Pod Sennen 300 follows identical care principles to the smaller Sauna Pod Sennen, simply applied across more surface area. After every session, leave the door open for twenty to thirty minutes to let the heat room dry out fully, preventing mould and dark staining over time. Wipe benches down once cooled, and sand the interior lightly once or twice a year wherever group use creates the most contact wear.
The tempered glass door and window need only a standard glass cleaner and soft cloth. The built-in changing area should be checked periodically for dampness, particularly given the higher likelihood of more frequent group use putting more towels and robes through the space.
Externally, treat the Thermowood exterior with a wood treatment every two to three years, budgeting more time for this larger structure than the smaller Sauna Pod Sennen would need. The arched roofline sheds water differently to a flat roof, so check drainage along the curve and base periodically, particularly after stormy weather or heavy autumn leaf fall, ensuring nothing pools against the lowest timber courses.
Delivery
Production takes 10-12 weeks, plus 1-2 weeks dispatch time for haulage. Due to its size and weight, this sauna ships on an oversized pallet (typically around a tonne or more) and arrives kerbside on a flatbed truck. Free UK mainland shipping applies, but additional charges may apply by postcode for length, weight, or restricted access, quoted separately.
Because of its size and weight, this item cannot be unloaded by tail lift and unloading is not included in the price — it needs arranging in advance. Depending on your access, you have three options:
- Forklift – if there's space to move the pallet from the truck to its final position, this is the most cost-effective choice.
- HIAB – for lifting over a fence or wall near the road, a HIAB (truck-mounted crane) is a practical and affordable option.
- Crane – if the final position is far from the road and forklift access isn't possible, a crane will be needed.
Handballing is possible but requires a full team of able helpers and suitable lifting equipment at every stage, and is done at your own risk. We can help source a forklift, HIAB, or crane in your area for an additional fee — if you're unsure which suits your site, contact us before ordering and we'll advise. Please have a solid, level base and clear access ready before delivery. Final positioning is not included unless you use our installation team; once unloaded, moving and positioning the goods is your responsibility.
The arched sauna pod sennen, sized for real groups
From Your Sketch
To Reality ✏️
A sauna built entirely around your space, your ideas and how you want it to feel.
Send us your hand-drawn sketches, and we’ll turn them into detailed CAD designs ready to bring your vision to life.
Curved Space for Six
Designed to Heat Efficiently
Every curve has a purpose, helping your sauna reach temperature faster while delivering an even, enveloping warmth.
Crafted from Exceptional Spruce
Natural spruce or heat-treated for durability and stability, our premium timber is chosen for its natural beauty and long-lasting performance.
Premium Tempered Glass
Our premium bronzed 8mm thick tempered glazing delivers a refined finish, excellent durability and complete confidence in every sauna.