01
GPU coolant loop
Cold plate, pump, locked inside the cabinet. It never mixes with building water.
For hotels
Preheat the water. Hold the pool. Keep the boilers.
One managed node in the plant room. Heat moves into a preheat loop for domestic hot water and, where the circuit allows, the swimming pool. You pay no capex for the pilot.
Book a plant-room survey
Where the heat goes
Two sinks. One exchanger.
Pools want low-grade heat for hours at a time. Guest water wants a warm start before the boiler finishes the job. The node is sized for that, not for replacing plant.
02
Double-wall exchanger
The only place the two loops meet. Leak detection isolates power.
03
Both
One exchanger, two building-side uses. Surveyed. Neither replaces the equipment the guests already rely on.
The pilot
Six months. We own the box.
- Arete installs, maintains, and operates the node.
- Metered incremental electricity is reimbursed where that is agreed.
- You receive a monthly heat and carbon report.
- Removal is available if safety or guest hot-water KPIs are not met.
01
Site survey
Plant room, electrical headroom, DHW preheat, and — if there is one — the pool circuit.
02
Install one node
We own the hardware. Two loops. A double-wall exchanger where the design requires it.
03
Measure
Metered heat, metered power, and a monthly report. Incremental electricity reimbursed where agreed.
04
Keep or remove
Six months. If safety or guest hot-water KPIs are not met, the hotel can request removal.
Illustrative model
What one node can offer a plant room
Output belongs to the node, not to a promise about the hotel bill. More rooms means the same heat is a smaller share of the load. A pool is a second place for low-grade heat to go.
Suggested starting node for this sketch: H2 — pool circuits like a steady base load.
H1
19–24 kWh/day
Recoverable heat, typical day. Not a saving guarantee.
- Electrical draw
- 0.8–1.0 kW
- Energy equivalence
- 1,233 L raised 15°C
- Heat sinks
- DHW preheat + pool loop
Equivalence is physics of the midpoint of the published range (about 0.017 kWh per litre per 15°C). It is not delivered hot water and not a forecast of gas displaced. A survey confirms the pool connection.
Questions from engineering and FM
Does the pool get the same heat as the taps?
Where the survey shows a suitable connection, the building-side loop can preheat both the domestic hot-water cylinder and the pool circuit. The pool’s own heater still holds the setpoint. We do not replace pool plant, dosing, or filtration.
Who owns the GPU?
Arete Heat Cloud owns and operates the appliance. The hotel hosts it and receives metered heat plus reporting. The hotel does not buy the hardware and is not a revenue-share participant.
What if the GPU stops?
Compute shuts down before it can compromise building-side hot-water safety. Existing plant carries guest hot water and the pool, as it does today.
What about legionella control?
Storage and distribution temperatures stay with the hotel’s existing regime. The node only contributes upstream preheat.