♨️ Gecko IN.GRID Heat Pump Control — Smart External Heat Source Manager for Your Spa

Take command of your hot tub’s heating strategy and unlock serious energy savings with intelligent multi-source control

🔥 Product Overview

The Gecko IN.GRID Heat Pump Control is a smart system interface that lets you integrate external heat sources — heat pumps, central heating boilers, or gas heaters — directly into your Gecko Y Series spa control system. Rather than relying solely on your spa’s built-in electric heater, the IN.GRID acts as an intelligent dispatcher, coordinating how internal and external heating sources work together to maintain your ideal water temperature.

Manufactured by Gecko Alliance in Québec, Canada, this compact module connects to the CO port on your existing spa pack and is automatically detected at power-up — no additional electrical supply required. Five distinct heating modes let you choose the balance between maximum energy savings and heating performance, while the built-in in.touch 2 app compatibility means you can switch modes from your smartphone without ever opening the spa skirt.

Beyond heating, the IN.GRID doubles as an accessory hub with four in.k110 switch ports, giving you independent push-button control over pumps, blowers, lights, and other spa features from different seating positions.

✨ Key Features

✅ Five Intelligent Heating Modes — Disabled, Internal, External, Both, and Smart modes let you tailor heating strategy to your climate, energy goals, and installation

✅ External Heat Source Integration — Connect heat pumps, central heating systems, or gas heaters via a normally open dry-contact relay rated at 24V / 4A

✅ Smart Mode with Adaptive Backup — Prioritises your external heat source and only activates the internal electric heater when the water temperature falls 1.4°C below the set point

✅ Automatic Freeze Protection — In External mode, the internal heater kicks in automatically if water drops to 4.5°C, maintaining heating until 15°C is reached

✅ Four Accessory Control Ports — Connect up to four in.k110 single-button switches to independently control pumps, blowers, lights, waterfalls, and more

✅ CO Port for Daisy-Chaining — Additional Gecko modules can be connected in the communication chain via the built-in CO connector

✅ No External Power Required — Powered entirely through the in.link cable from your spa control system — zero additional wiring

✅ in.touch 2 App Compatible — Change heating modes remotely from your smartphone; the app auto-detects the IN.GRID and adapts its menu

✅ IPX5 Water Resistance — Protected against water jets from any direction, suitable for installation under the spa skirt

✅ Plug-and-Play Detection — Automatically recognised by the spa control system at power-up, operational within one minute

✅ Internationally Certified — UL 1563, CAN/CSA C22.2 No. 218.1-M89, and CE EMC 2014/30/EU

⚙️ Technical Specifications

Specification	Value
Part Number	0608-521033
Product Type	4 Switch + CO + Heat Pump Control
Manufacturer	Gecko Alliance
Relay Output	Normally open dry-contact, 24V AC max, 4A max
Wire Gauge (Relay Connection)	AWG 24 to AWG 16
Cable Jacket Diameter	2.3 mm to 6.4 mm (for watertight grommet)
Accessory Ports	4 × in.k110 single-button switch connectors
CO Port	1 × CO connector for communication daisy-chaining
Dimensions (W × H × D)	140 mm × 114 mm × 47 mm
Weight	0.39 kg (0.85 lb)
Operating Temperature	-20°C to 60°C
Storage Temperature	-30°C to 85°C
Maximum Humidity	70%
Water Resistance	IPX5
Power Supply	None required — powered via in.link cable
Heating Modes	5 (Disabled, Internal, External, Both, Smart)
Certifications	UL 1563, CAN/CSA C22.2 No. 218.1-M89, CE EMC 2014/30/EU

🌡️ Heating Mode Operations

The IN.GRID offers five heating modes, selectable via jumper settings on the unit or remotely through the in.touch 2 smartphone app:

1. DIS (Disabled) Heating control is deactivated. Use when no external heat source is connected and you only need the accessory switch functionality. The spa’s standard electric heater manages all temperature regulation as normal.

2. INT (Internal) The spa uses only its built-in electric heater. Provides an easy way to revert to standard heating if your external source needs servicing — switch via the in.touch 2 app without opening the spa skirt.

3. EXT (External) Maximum energy savings. The spa relies entirely on your external heat source for temperature regulation. The internal heater stays off during normal operation. Built-in freeze protection activates the internal heater if water drops to 4.5°C, maintaining heating until 15°C is reached.

4. BOTH (Simultaneous) Both heating sources operate together at all times. Ideal for swim spas or large-volume spas that need maximum heating power to maintain set point temperatures in cold climates.

5. SMART (Energy Savings) The most intelligent mode. Your external heat source handles primary heating. The internal electric heater only activates as backup when water temperature falls 2.5°F (1.4°C) below the set point, then switches off once the target is reached. Balances efficiency with reliable temperature maintenance.

💡 The heating mode is set via jumper position during installation but can be changed at any time using the in.touch 2 mobile app, which overrides the physical jumper setting.

💷 Energy Savings Potential

The primary benefit of the IN.GRID is reducing hot tub running costs by shifting the heating load to a more efficient external source.

Current UK Electricity Rate: £0.277/kWh (Ofgem Price Cap, Q1 2026 — January to March)

Heating Method	Estimated Cost per kWh	Relative Efficiency
Standard Electric Heater	£0.277/kWh	Baseline
Air Source Heat Pump (COP 3–5)	£0.055–£0.092/kWh effective	3× to 5× more efficient
Gas Central Heating (via heat exchanger)	£0.059/kWh (gas rate) + pump costs	Significantly cheaper than electric

A typical hot tub using an electric heater running 4–6 hours daily could cost £300–£500 per year in electricity. Switching primary heating to an air source heat pump with a COP of 4 could reduce heating costs by up to 75%, potentially saving £225–£375 annually. The IN.GRID’s Smart mode further optimises this by only calling on the electric heater when absolutely necessary.

⚠️ Actual savings depend on your external heat source efficiency, climate, hot tub size, insulation, usage patterns, and current energy tariffs. Figures above are estimates for illustrative purposes.

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🛠️ Installation Requirements

The IN.GRID requires no external power supply or additional electrical circuit.

Requirement	Detail
Power Supply	None — powered via in.link cable
Connection	CO port on compatible Gecko Y Series spa control system
Relay Wiring	AWG 24 to AWG 16 gauge, round jacket cable (2.3–6.4 mm diameter)
Relay Rating	24V AC max, 4A max (dry-contact, normally open)
Mounting	Upright position, secured with #8 pan head screws
Location	Under spa skirt, protected from outside weather

With External Heat Pump or Gas Heater: The external heat source connects in the same water pipe line as the spa control system’s internal heater, installed after the spa pack in the water circuit. It must have its own flow and temperature limit protections and be set to maximum set point — water temperature regulation is managed via the spa keypad. The IN.GRID’s dry-contact relay connects to the heat source’s remote control input (on gas heaters, typically the “fireman’s switch”). Voltage must not exceed 24V.

With a Heat Exchange Unit (Central Heating): The dry contact controls a low-voltage relay coil powering an auxiliary pump that circulates water through the heat exchange unit. The exchange must not restrict flow — the Y Series spa pack requires a minimum of 20 GPM at all times.

⚠️ Installation must be carried out by a qualified spa technician. The external heat source must be compatible with the IN.GRID’s 24V / 4A dry-contact remote switching method. Incorrect installation may void warranty and create safety hazards.

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🛡️ Safety Features & Certifications

Built-in Protection:

✅ Automatic freeze protection in External mode — internal heater activates at 4.5°C, heats until 15°C

✅ Diagnostic LED — solid light confirms spa system detected; blinking indicates communication issue; no light means power off

✅ Heat LED — solid light when relay contacts closed and external heating active; off when inactive

✅ IPX5 water resistance — protected against water jets from all directions

✅ Watertight cable grommet for relay wiring entry

✅ No user-serviceable parts — tamper-resistant enclosure

Certifications:

✅ UL 1563 (Electric Hot Tubs, Spas, and Associated Equipment)

✅ CAN/CSA C22.2 No. 218.1-M89 (Canadian electrical safety)

✅ CE EMC 2014/30/EU (European electromagnetic compatibility)

🎯 Compatibility Guide

Control System	Software Requirement	Status
in.ye-5	Software 338, revision 6 or later	✅ Compatible
in.yt-7	Software 349, revision 3 or later	✅ Compatible
in.yj	Core 61, revision 46 or later	✅ Compatible
in.ye	Core 61, revision 46 or later	✅ Compatible
in.yt	Core 61, revision 46 or later	✅ Compatible

Compatible External Heat Sources:

✅ Air source heat pumps (with remote switching input)

✅ Central heating systems (via heat exchange unit and auxiliary pump)

✅ Gas heaters (via fireman’s switch input)

✅ Any heat source compatible with 24V / 4A dry-contact relay switching

Compatible Accessories:

✅ in.k110 single-button switches (up to 4)

✅ in.touch 2 WiFi module (for remote smartphone control)

✅ Other Gecko CO-port devices (daisy-chained via the IN.GRID’s CO port)

⚠️ The IN.GRID is NOT compatible with non-Gecko spa control systems. Verify your control system model and software version before purchasing.

🎛️ Accessory Control & in.k110 Configuration

Each of the four AC ports connects to an in.k110 switch, with the controlled function set by jumper:

Jumper Position	Function
P1 – P5	Pump 1 through Pump 5
BL	Blower
LST	Last pumps & blower (sequential control)
WF	Waterfall
AUX	Auxiliary
L	Lights (dual outputs controlled in sequence)

Factory Default Settings (Part #0608-521033):

AC Port	Default Function
AC #1	P1 (Pump 1)
AC #2	P2 (Pump 2)
AC #3	LST (Sequential)
AC #4	L (Lights)
Heat Mode	DIS (Disabled)

❓ Frequently Asked Questions

Q: Does the IN.GRID need its own power supply? A: No. It draws all power from your spa control system through the in.link cable. No additional electrical circuits are required beyond the relay connection to your external heat source.

Q: Can I change the heating mode without opening the spa skirt? A: Yes. With the optional in.touch 2 WiFi module, you can change modes directly from your smartphone. The app automatically detects the IN.GRID and adapts its menu.

Q: What happens if my external heat source fails in cold weather? A: In External mode, automatic freeze protection activates the internal heater if water drops to 4.5°C, maintaining heating until 15°C is reached. You can also switch to Internal mode via the in.touch 2 app for full electric heating.

Q: Is this compatible with my spa system? A: The IN.GRID works exclusively with Gecko Alliance Y Series systems (in.yj, in.ye, in.yt) running software core 61, revision 46 or later. For specific models: in.ye-5 requires software 338 rev 6+, in.yt-7 requires software 349 rev 3+.

Q: Can I use this with any heat pump? A: Your external heat source must be compatible with a normally open dry-contact relay rated at 24V / 4A. Most heat pumps and gas heaters with a remote on/off or temperature control input will work, but verify compatibility with your specific unit before installation.

Q: What is the difference between the two IN.GRID models? A: Part #0608-521033 (this model) has 4 in.k110 switch ports plus 1 CO port for daisy-chaining. Part #0608-521034 has 5 switch ports but no CO port, so it must be the last device on the communication chain.

Q: Do in.k110 switches come included? A: No. The in.k110 single-button switches are sold separately.

Q: How do I know if it is connected properly? A: The diagnostic LED shows connection status — solid light means the spa system is detected, blinking means not detected or not compatible, no light means power is off. The heat LED shows relay status — solid when external heating is active.

📥 Downloads & Resources

📄 IN.GRID TechBook (English PDF) — Complete technical manual with installation diagrams, wiring guides, and full specifications

🏆 Why Choose the Gecko IN.GRID Heat Pump Control

✅ Cut heating costs by up to 75% by switching primary heating to an efficient external source

✅ Five flexible modes to match any climate, energy strategy, or installation scenario

✅ Smart freeze protection keeps your spa safe even in the coldest weather

✅ Zero additional electrical work — connects via in.link cable with no external power needed

✅ Smartphone control via in.touch 2 app — change modes without accessing the equipment bay

✅ Dual functionality — heating management plus four independent accessory switches in one compact unit

✅ Internationally certified to UL, CSA, and CE standards

✅ Proven reliability from Gecko Alliance, a global leader in spa control technology

🤝 Why Buy from Parts4Tubs

✅ Specialist hot tub parts knowledge — advice from people who understand your system

✅ Competitive pricing

✅ Fast UK delivery

✅ Full warranty support

✅ Easy returns policy

✅ Extensive range of compatible Gecko parts and accessories in stock

✨ Summary

The Gecko IN.GRID Heat Pump Control (Part #0608-521033) is the smart way to integrate external heat sources with your Gecko Y Series spa system. Five intelligent heating modes — including Smart mode for maximum efficiency and automatic freeze protection in External mode — let you dramatically reduce running costs by harnessing heat pumps, central heating, or gas heaters alongside your spa’s built-in electric heater. With four accessory control ports, in.touch 2 smartphone compatibility, IPX5 water resistance, and UL/CSA/CE certification, it delivers flexibility, savings, and peace of mind in one compact, plug-and-play module. Order today from Parts4Tubs for fast UK delivery and expert support.