Hot Tub Summer: Drain or Keep Full?

Short Answer: No, draining your hot tub and leaving it empty for the summer is generally not recommended. It can dry out seals, gaskets, and O-rings, leading to cracks, leaks, and costly repairs when you refill it. Residual water in lines and jets can also foster bacteria, mold, or biofilm. Most hot tub owners and experts suggest keeping it full, turning the temperature way down (like 85–93°F to use as a cool pool), and doing minimal maintenance instead.

Quick Summary

• Best option for most people: Keep water in it, lower the temp, reduce filtration cycles, and check chemicals weekly.
• Risks of emptying: Dry seals/gaskets, potential shell damage, bugs/rodents, and gunk in plumbing.
• If you must drain: Blow out all lines thoroughly, clean everything, and keep it covered—but this carries higher risk.
• Benefits of running low: Enjoy as a refreshing summer pool with jets, lower long-term repair costs, and easier startup in fall.

Should You Drain Your Hot Tub for Summer? Expert Advice + Real Owner Experiences

Hot tubs are built for year-round use. Many owners in warmer months face the same dilemma as in your Facebook thread: it’s hot outside, bugs are bad, the cover is heavy, and usage drops. But the majority of experienced owners and professionals strongly advise against leaving it empty.

From forums, manufacturer guides, and owner groups, the risks outweigh the short-term conveniences like skipping weekly chemicals or dealing with a heavy cover.

Why Leaving It Empty Can Cause Problems

• Seals, gaskets, and O-rings dry out: Without water, these rubber/plastic parts shrink, crack, or harden. When you refill in fall, leaks often appear around pumps, jets, or unions. Many owners report this exact issue after draining.
• Residual water in plumbing: You can’t remove every drop manually. Stagnant moisture breeds bacteria, algae, mold, and biofilm—leading to nasty surprises (green/black chunks) when refilling.
• Shell and equipment damage: Acrylic shells can warp, bubble, or crack from temperature swings and UV exposure without water pressure inside. Pumps and heaters may also suffer.
• Pests: Empty tubs become “critter condos” for ants, bees, hornets, rodents, etc.
• Real experiences: Some people drain successfully for years (especially in garages or mild climates), but many others face leaks or repairs. Newer tubs with fresh seals might fare better short-term, but it’s still a gamble.

Better Alternative: Keep It Running on “Summer Mode”

This is the consensus recommendation from hot tub pros and long-time owners:

• Lower the temperature significantly — 85–93°F makes it refreshing like a cool pool with jets. Many call this “the best” for summer family fun.
• Reduce filtration cycles to the minimum (e.g., a couple hours a day) to save energy while preventing stagnation.
• Maintain water chemistry lightly:
  • Check pH, alkalinity, and sanitizer (chlorine/bromine) once a week or every 10 days.
  • Use minimal sanitizer—some add a bit of MPS or dichlor as needed.
  • Consider products like Spa Marvel for lower-maintenance, more natural treatment.
• Keep the cover on when not in use to block debris, reduce evaporation, and protect from sun.
• Top off water levels as needed (evaporation is higher in heat).
• Clean filters more often in summer due to pollen, sunscreen, etc.

This approach uses very little power (heater rarely kicks on in hot weather) and keeps your tub healthy. Many owners with pools still prefer the hot tub for its jets even in summer.

If You Decide to Drain Anyway (Not Ideal)

If power limits, extreme heat in a garage, or other reasons force you to empty it:

1. Drain completely.
2. Purge/clean first — Run a cleaner through the system.
3. Blow out or vacuum all lines, jets, and plumbing thoroughly (shop vac or air compressor).
4. Wipe down the shell and around jets.
5. Secure a high-quality, locked cover to protect from UV and debris.
6. Consider a professional inspection before refilling in fall.

Even then, risks remain—plan for possible repairs.

Additional Summer Hot Tub Tips

• Energy savings: Lower temps + minimal cycles = big reduction in costs.
• Bug control: Use natural repellents around the area if keeping it full.
• Family enjoyment: Turn it into a cool family spot—kids love the jets!
• Professional help: Have a trusted technician on speed dial for fall startup if issues arise.

Your hot tub is an investment meant to last years with proper care. Running it low in summer usually saves more hassle and money long-term than draining.

Ready to Sell or Upgrade Your Hot Tub?

If you’re thinking about selling your current hot tub (or buying a new one), check out Commonplace Marketplace—a great platform for everyday items like hot tubs, pools, and outdoor gear. List yours easily and connect with local buyers. Visit Commonplace Marketplace →