Hydronic Underfloor Heating

Your home has a hydronic underfloor heating system installed by Dylan Eckermann at Eckermann Heating & Cooling.

📞 Call Dylan ✉ Email Dylan 📅 Book annual service

The system circulates warm water through pipes embedded in the concrete slab, paired with an LG THERMA V R32 Monobloc heat pump controlled by a Zennio Z35 thermostat.

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How it works

Heat is delivered directly to the floor by warm water through pipes in the slab. Designed to work with your PV solar system — the slab acts as a battery. Solar charges the slab during the day; the slab radiates heat through the night.

Recommended use

• The system takes around 10 hours to reach temperature when first turned on each winter. The slab also takes a long time to cool down.
• Start at 21°C and increase by 1°C at a time until comfortable.
• Set the timer to run the heat pump during daylight hours to use free solar.

🚨 CRITICAL — DO NOT switch off power to the heat pump

When the system is no longer needed, turn it off at the thermostat only. The heat pump must have 240V power to it at all times to prevent a seized pump.

Manifold Operation

The manifold is the key control point. It lets you turn heating on or off in individual rooms.

• The top (flow) section distributes hot water. Red indicators show litres per minute.
• The bottom (return) section has blue taps. Turn clockwise to reduce heat to a room, anti-clockwise to increase.
• Each circuit is labelled with the room name.

Flow rates were set during commissioning. If a room is consistently too hot or too cold, adjust that circuit’s blue tap — not the thermostat.

Zennio Z35 Thermostat — Video Tutorials

Four short YouTube tutorials cover the most common tasks:

Set the time

Switch to heating

Switch to cooling

Set the timer

LG THERMA V App Control

If installed with the optional Wi-Fi modem (LG PWFMDD200), you can also control the heat pump via the LG ThinQ app on your phone for remote temperature changes and scheduling.

Annual Service — MANDATORY

The hydronic system must be serviced annually before winter. Book between March and May.

Service	Cost (inc GST)
Call-out fee	$110 (waived if technician in your postcode)
Standard service (testing thermostat, checking pump rotation, cleaning condenser fins)	$220
Water treatment refill (Fernox, if needed)	$88 per bottle
Additional work	$88 per hour + parts

What the annual service covers

• Fernox water treatment concentration test
• pH check (must stay below 8.0)
• System flow rate check and air bleeding
• Heat exchanger inspection and cleaning
• Pump and condenser fin cleaning

🚨 CRITICAL — Adelaide is a hard-water area

Fernox water treatment concentration must be tested annually. A pH above 8.0 voids the manufacturer warranty and dramatically reduces the life of the heat pump.

Book the annual service through Eckermann Heating & Cooling on 0416 967 882 or at hydronicunderfloor.com.au.

📞 0416 967 882 📅 Book annual service online

Pressure Test Certificate

A pressure test certificate has been issued for your installation and is included in this handover pack.

• Operating pressure: 200 kPa
• Maximum operating temperature: 55 °C

Troubleshooting — “I’m cold, the heater isn’t working”

1. Check the thermostat is set higher than the current room temperature.
2. If the heat pump fans aren’t running:
   • Switch the heat pump isolator OFF.
   • Wait 3 minutes.
   • Switch the isolator back ON.
   • Wait 10 minutes for the fans to start.
3. If the fans still don’t start after 10 minutes, call Dylan or book online.

Warranty Summary

Component	Warranty
AUSPEX Radiant UFH Oxygen Barrier in-slab pipe	25 years
AUSPEX manifolds, valves, circulating pump, electrical control system, actuators	2 years

Owner DO NOT

• Turn off the power supply to the heat pump.
• Adjust the silver ball valves at flow / return pipes — commissioning-only.
• Skip the annual service.