Balboa Heat Modes Explained: Ready, Rest, Economy and Sleep — What They Actually Mean

If you’ve got a Balboa-controlled hot tub and you’re not sure what all those heating modes do, you’re not alone. I get asked about this constantly — and it genuinely matters. Get it wrong and you’re either burning electricity you don’t need to, or you’re jumping in expecting 38°C and getting a lukewarm surprise.

Let me break it all down.

You can also find me on my socials;

Why it matters more than you think

Your heat mode is the single biggest lever you have over your running costs. The difference between leaving your tub in Ready mode vs Rest mode through a week you’re not using it can easily be the difference between £5 ($8) and £15 ($20) in electricity — multiply that up over a year and it’s real money.

There’s also a reliability angle. I’ve had people contact me convinced their heater was broken, when they’d accidentally bumped their tub into Economy or Sleep mode. Knowing what these modes look like on screen — and how to get out of them — saves a lot of stress.

---

The newer BP system: Ready, Rest and Ready-in-Rest

If your hot tub has a TP-series topside (TP200, TP400, TP500, TP600, TP700 etc.) or a spaTouch panel, you’re running on Balboa’s BP control system. These panels use a different set of modes to the older VS/GS systems, but the principles are identical.

Ready Mode 🔴 R

Ready mode is your day-to-day setting if you use your tub regularly. The control system keeps the water within about 1°F of your set temperature around the clock. It does this by periodically running the pump at low speed to check the water temperature — this is called “polling” — and firing the heater whenever it drops.

Think of it like a central heating thermostat. It’s always watching, always ready. You press Jets, you get hot water.

When to use it: Winter, or any time you’re in the tub more than two or three times a week.

Rest Mode 🔁 IR

Rest mode only heats the water during your programmed filter cycles. Outside of those cycles, the heater does nothing — the tub just sits at whatever temperature it naturally drifts to.

This is where people get caught out. If your filter cycles are set to run for two hours in the morning and two hours in the evening, and you jump in at 3pm, the water might be 10°C off your set temperature. The display will show “RUN PUMP FOR TEMP” — which is the panel’s way of telling you the temperature reading isn’t current and it’s trying to catch up.

When to use it: If you’re only using the tub once or twice a week, or you’re away for a few days but want the system ticking over.

Important: In cold UK winters, I wouldn’t run Rest mode for extended periods without thinking about freeze protection. The system will still activate freeze protection automatically if the sensors detect low enough temperatures, but if your filter cycles are very short, the water can get cold.

Ready-in-Rest Mode 🔁🔴 RR

This is a clever one — and it’s not something you can select directly from the menu. It’s a sub-mode that activates automatically when you’re in Rest mode and you press the Jets 1 button.

The control system assumes you want to use the spa, so it switches temporarily into Ready mode for one hour and heats the water to your set temperature. After that hour, it drops back into Rest mode without you having to do anything.

In practice this means: if you’re in Rest mode to save energy but you decide you want a soak, just press Jets 1 about an hour before you want to get in. The tub will heat itself up, then return to Rest when it’s done.

---

The older VS/GS systems: Standard, Economy and Sleep

If your topside is a VL-series panel (VL200, VL260, VL400, VL404, VL600S, VL800S etc.), you’re on an older Balboa VS or GS system. These use three modes instead of two.

Standard Mode (ST)

This is the equivalent of Ready mode on BP systems. The tub maintains your set temperature 24 hours a day. It polls the water every 30 minutes or so, heats if needed, and is always ready to go. Default setting from the factory.

When to use it: Whenever you’re using the tub regularly, and definitely during winter.

Economy Mode (EC / ECN / ECON)

Economy is the equivalent of Rest mode on BP systems. Heating only happens during filter cycles. Between filter cycles, the tub does nothing and the water temperature will drop.

Despite what the name implies, you won’t save a huge amount unless you’re also timing your filter cycles to run during off-peak electricity tariff hours. If your filter is only set to F1 (1 hour every 12 hours) and you’re in Economy mode in December, the tub will barely heat at all. Most people with this issue have no idea Economy mode is even switched on — they just know their water is cold.

On the display: when the water temperature isn’t current (i.e. hasn’t been measured recently), you’ll just see “EC” or “ECON” flashing instead of a temperature. When the pump runs and takes a reading, it alternates between the mode name and the actual temperature.

When to use it: Spring and autumn if you’re a weekend user. In summer if you’ve got good insulation, Economy can work well.

Sleep Mode (SL / SLP)

Sleep mode is the most aggressive energy-saving setting. It will only heat during filter cycles, same as Economy — but here’s the key difference: it will only heat to within 20°F (about 10°C) of your set temperature, not all the way to it.

So if your set temperature is 38°C, Sleep mode will only heat to around 28°C. It’s designed for when you’re going away on holiday and you want the tub to stay alive but use minimal energy. You’re not trying to use it, you just don’t want to come back to a frozen or stagnant tub.

This is the mode most likely to cause confusion. If someone accidentally hits the wrong button sequence on a VL-series panel, the tub can end up in Sleep mode and won’t heat properly no matter what temperature you set. If your water is stuck around 10°C below where it should be, Sleep mode is the first thing to check.

---

How to actually change the mode — by topside control

This is where it gets specific, because the button combination is different depending on which control you have.

BP System (TP200 / TP400 / TP500 / TP600 / TP700 / spaTouch)

On these panels you navigate through the menu:

Settings → Heat → Heat Mode → toggle between Ready and Rest

On TP600 and TP700 specifically, you can also access it with a button sequence: press the Temperature Up or Down button, wait for the temperature to start flashing, then press Lights. Keep pressing Lights and you’ll cycle through FLIP, then FLTR, then MODE. At MODE, press Temp Up or Down to toggle between SET READY and SET REST. Press Lights to confirm.

VL-series without a Mode button (VL200, VL240, VL260, VL400, VL401, VL402, VL403, VL404, ML200, ML260, ML400)

Press Temp, then immediately press Light. The mode will cycle through Standard → Economy → Sleep with each press of Light. The display will confirm which mode you’re setting.

VL-series with a Mode button, on a GS system (VL600S, VL700S, VL701S, VL702S, VL801D, VL802D)

Press Warm or Cool, then press Mode/Prog. Each press of Mode cycles through the options.

GL system (ML900, ML700, ML550, ML551)

Press Mode, then press Cool to cycle through the options, then press Mode again to confirm.

---

The quick reference

---

My honest take

For most UK hot tub owners, Ready mode in winter and Rest mode in summer is the right approach. The difference in running costs between the two is real, but Ready mode in winter is worth it — you don’t want to wait two hours for your tub to heat up when it’s 2°C outside.

If you’re going away, switch to Rest mode on a BP system or Sleep mode on a VS/GS system. Don’t turn the tub off completely. The energy cost of reheating from cold is almost always higher than the cost of keeping it ticking over in a low mode.

And if your tub is displaying EC, ECON, SL or SLP and you’re not sure why — now you know what you’re looking for and how to get out of it.

Can I Help You?

If I can help you in any way I would love to hear from you. You can get in touch using the form below.

Thanks - Andi

 

Hi, Andi here. I own Buildahottub.com and also write all of the articles and info pages on the site. Some years back now, I built my own hot tub but struggled to find the information I needed. So, once my tub was complete, I started this website to help others in their own pursuit of hot tub and plunge pools DIY building information.

Fast forward to 2025, I've helped over 1400+ DIY customers just like you all over the world build hot tubs and pools. Have a good look around the site, there are lots of resources here. Please do get in touch if I can help you. - Cheers, Andi