HeatNet Flex

Central Control

The Transom HeatNet Flex Central Control sequences up to sixteen Transom heat pumps and HeatNet-compatible gas water heaters as one coordinated hybrid plant. It stages equipment by runtime, keeps heat pumps as the primary source, and calls on gas water heater capacity only when outdoor air, return water temperature, or load conditions require it – holding down both carbon output and operating cost without field-written logic or manual retuning.

Seamlessly integrate heat pumps, domestic hot water heaters, and swing tanks.

Hybrid systems prioritize flexibility, resilience, and peak performance while all‑electric systems prioritize maximum decarbonization and code alignment. There’s no universal “winner”. The right choice depends on a variety of application-specific factors such as load profile, climate, infrastructure, utility rates, and owner risk tolerance.

A hybrid gas + heat pump DHW plant delivers:

Lower operating costs
Reduced carbon emissions
High peak capacity without oversizing
Fuel diversity and resilience
Easier retrofits and future flexibility

System Overview

Runs heat-pump-only or hybrid HP/gas water heater plants from a single controller
Automatically balances installed cost, operating cost, and carbon reduction
Coordinates the full HeatNet ecosystem – Transom heat pumps, HeatNet gas water heaters, and swing tanks – over one communication layer
Guided hybrid-system configuration in place of field-programmed logic
Application flexibility – supports DHW systems with multi-sensor stratified tanks, single-sensor storage tank, and system return/system supply configuration

Interface

10.1″ capacitive touch display
HeatNet-networked – up to 16 devices
Dual-key locking enclosure with USB service port
Enclosure: 16″W x 20″L x 7″D
120VAC, 5A input power

On The Display

Home Screen – Swing Tank

Every input, output, and relay state exposed for fast troubleshooting – gated behind five levels of password-protected access.

System Configuration

Guided setup for hybrid mode, swing tank control, and sanitize scheduling. Supports multi-sensor stratified tanks or single-sensor storage/return/supply.

Diagnostics

Every input, output, and relay state exposed for fast troubleshooting – gated behind five levels of password-protected access.

Thermal Network

Up to 16 devices: Transom heat pumps + HeatNet gas water heaters
Devices staged by runtime for even equipment wear
N+1 gas water heater feature for redundancy
HeatNet or 3rd party swing tanks supported

Hybrid Prioritization

Heat pumps run first; gas water heaters supplement under high load
Switchover triggers on outdoor air temp or high return water temp
Tunable to local energy rates to minimize operating cost
Reduces cycling on higher-value heat pump equipment

Sanitize Mode

Swing tank raises system-wide temperature to control bacteria
Scheduled, or activated manually from the display or BMS

Full Recovery Mode

Swing tank recharges stratified tanks when HPs can’t keep pace with demand
Scheduled, or activated manually from the display or BMS

Communications

Native Modbus RTU – BACnet IP and BACnet MS/TP supported with optional bridges
Planned: CTA-2045B smart grid connectivity for utility demand response
Planned: remote monitoring

Economic Carbon Reduction, By Design

Balance initial cost, operating cost, and carbon reduction automatically.