I’m working on a DIY cooling setup using an Eight Sleep Pod 5 King cover that I currently own (no pod) as the mattress-side water grid, but replacing/bypassing the Eight Sleep hub with my own external cooling loop.

The goal is cooling only for now. I don’t care about heating. I also don’t want a permanent bucket/reservoir sitting in my bedroom, so I’m trying to build this as a mostly closed loop with fill/bleed/drain ports.

I’m posting because I’d like people to tear this apart before I buy everything. If there’s a flaw in the flow rate, pressure, tubing assumptions, pump choice, chiller choice, noise, condensation risk, etc., I’d rather find out now.

What inspired this

The main inspiration was this Truffle Security post:

https://trufflesecurity.com/blog/removing-jeff-bezos-from-my-bed

They used an Eight Sleep cover and connected the tubing to an aquarium chiller. That made me realize the useful part of the Eight Sleep system, for my purposes, is really the water-circulating cover.

I also looked at a bunch of other DIY / repair / teardown posts:

• The 1/8th Sleep https://near.blog/the-1-8th-sleep/ What I took from this: keep the system modular and serviceable; don’t overcomplicate the mattress side.
• TechTeamGB DIY bed watercooler/heater https://techteamgb.co.uk/2024/11/18/i-made-a-custom-bed-watercooler-open-source-diy-bed-cooler-heater-eight-sleep-type-thing/ What I took from this: external cooling hardware can work, but building the entire pad/control system from scratch is more complexity than I want.
• Homemade EightSleep Reddit prototype https://www.reddit.com/r/EightSleep/comments/1heaeh2/homemade_eightsleep/ What I took from this: the concept is doable, but I’d rather use the real Eight Sleep cover instead of making my own tubing pad.
• Update to Homemade Eight Sleep https://www.reddit.com/r/EightSleep/comments/1nc50rr/update_to_homemade_8_sleep/ What I took from this: custom controls are interesting, but I don’t want to design a full appliance right now.
• Pod 2 teardown / repair discussion https://www.reddit.com/r/EightSleep/comments/1dnjut4/pod_2_teardown/ What I took from this: don’t trust zip ties as hose clamps. Use real clamps. Leak prevention matters more than saving $10.
• Pump swap / repair post https://www.reddit.com/r/EightSleep/comments/1i4ulwv/swapping_a_pump/ What I took from this: the Eight Sleep pump class seems to be closer to a small 12V brushless DC circulation pump, roughly 7 L/min / 3 m head / 6–7 W, not a giant aquarium or pond pump.
• Tubing material discussion https://www.reddit.com/r/EightSleep/comments/16s07wz/what_material_do_they_use_for_tubing/ What I took from this: making the pad from random tubing is probably the wrong path. Heat transfer and comfort are hard. Better to use the actual Eight Sleep cover.
• Watercooling / mattress chiller thread https://www.reddit.com/r/watercooling/comments/1mjqoa6/been_looking_at_mattress_bed_water_coolers/ What I took from this: compressor chillers can work, but condensation and noise are real issues.
• DIY compressor-cooled mattress pad discussion https://www.reddit.com/r/vandwellers/comments/rj63ei/diy_compressorcooled_water_mattress_pads_air/ What I took from this: compressor cooling seems more practical than a weak Peltier setup if I actually want meaningful cooling.

Why I’m doing this

I like the Eight Sleep cover concept, but I don’t love being locked into the official hub/cloud/subscription ecosystem. I’m mainly trying to get a reliable cooling setup that is:

• quiet enough for a bedroom
• cooling-only
• serviceable
• leak-conscious
• not wildly expensive
• not dependent on a permanent open reservoir/bucket

I looked into thermoelectric/Peltier options because they’re closer to how Eight Sleep seems to work, but most DIY-friendly TEC setups look either underpowered, inefficient, noisy once fans are included, or expensive enough that I might as well use the official hub.

So I’m leaning compressor chiller.

Proposed build

Basic loop idea:

Eight Sleep Pod 5 cover outlet
-> small 12V brushless inline pump
-> aquarium compressor chiller
-> Eight Sleep Pod 5 cover inlet

Service ports:

High point:
T-fitting -> valve -> capped fill/bleed tube

Low point:
T-fitting -> valve -> drain hose to bucket

I do not want a permanent reservoir. I’m okay using a bucket only when filling, bleeding, or draining.

Proposed shopping list

Chiller

Poafamx / AL-160 / 42 gal / 1/10 HP aquarium chiller

Amazon examples I found:

• https://www.amazon.com/Poafamx-Aquarium-Chiller-Temperature-Constant/dp/B08C2X26S2
• https://www.amazon.com/Poafamx-Refrigeration-Compressor-Hydroponics-Freshwater/dp/B0C2Y22M1J
• https://www.amazon.com/Poafamx-Refrigeration-Compressor-Temperature-Hydroponics/dp/B0D17MKM3M

Reasoning: It’s a compressor model, relatively affordable, and some listings claim under 35 dB. I’m skeptical of that number, so I’d test it myself and return it if it’s loud.

Pump

TOPSFLO TL-B10-A12-0703 or similar 12V brushless DC pump.

Target pump specs:

12V DC
~7 L/min
~3 m head
~6–8 W
continuous duty
inline capable
not dry-run safe

Reasoning: This seems closer to the pump class used in older Eight Sleep units than a big aquarium pump. I originally looked at Sicce Syncra pumps, but they may be overkill flow-wise.

Pump power

12V DC power supply, probably 2A minimum, ideally UL-listed.

Tubing

Silicone tubing, but I’m not buying final adapters until I physically measure the Pod 5 tubing ID/OD.

Service fittings

• 2x barbed T-fittings
• 2x small ball valves
• caps/plugs
• drain hose
• optional flow indicator

Clamps

Stainless worm-drive or Oetiker clamps on every barb. No zip-tie-only connections.

Leak/safety

• leak tray / boot tray under all wet hardware
• water leak detector, probably Govee or similar
• GFCI outlet or plug-in GFCI adapter
• rubber/foam isolation under pump/chiller
• soft tubing near pump to reduce vibration transfer

Fluid

• distilled water
• some kind of compatible loop treatment / biocide

Still undecided here. I don’t want to use anything that might damage the Pod cover or tubing.

Things I’m unsure about

1. Is the Poafamx chiller actually quiet enough, or are the “under 35 dB” claims fantasy?
2. Is a 1/10 HP compressor chiller the right size for a king-size hydronic mattress cover?
3. Is the TOPSFLO-style pump too weak, too strong, or about right?
4. Should I add a tiny inline expansion chamber even if I don’t want a reservoir?
5. Is running this without a reservoir going to be annoying to fill/bleed?
6. Any reason this closed-loop design would create pressure problems for the Eight Sleep cover?
7. What’s the best way to avoid condensation if I’m cooling below room temp?
8. Any recommendations for safe biocide / loop treatment that won’t damage the cover?
9. Has anyone measured the Pod 5 cover tubing ID/OD or connector type?
10. Am I missing a better quiet compressor chiller under/near $350?

Basically: does this look reasonable, or am I about to build a quiet-looking but actually loud/leaky mattress aquarium?

Would appreciate any criticism, especially from people who have torn down Pods, repaired leaks, built DIY chillers, or measured the noise on these aquarium compressor units.

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