High Temperature Heat Pumps
Delivering flow temperatures up to 85°C — enabling direct decarbonisation of buildings where legacy heating infrastructure cannot be replaced.
Overview
What is a High Temperature
Heat Pump?
TI’s Ultra High Temperature Heat Pump is a DC inverter, two-stage compression system engineered to deliver water outlet temperatures up to 85°C. It uses a cascade refrigerant circuit — R32/R410A on the first stage and R134A/R515B on the second — to achieve the thermal lift that single-stage systems cannot reach while maintaining Energy Class A++ classification.
The significance is practical: the majority of existing commercial and public sector buildings in the UK were designed with heating systems operating at 70–80°C. Any heat pump that cannot match these temperatures requires costly replacement of emitters, pipework, and distribution — costs that frequently make standard heat pump retrofits unviable. This system eliminates that barrier entirely.
The decarbonisation unlock
When paired with TI's integrated BESS and supercapacitor technology — which eliminates the need for expensive DNO grid upgrades — the Ultra HT Heat Pump makes the business case for decarbonisation viable for assets that would otherwise remain stranded on gas. CE and RoHS certified. MODBUS compatible for BMS integration.
80°C – 85°C Outlet Capability
Matches the operating range of existing cast-iron radiators, high-temperature fan coils, and legacy district heating networks — no emitter replacement required. Golden finned heat exchanger with tube-in-shell design for durability and heat transfer efficiency.
BESS +
Supercapacitor Technology
Manages peak electrical demand
within existing grid capacity —
no DNO upgrade required.
DC Inverter — Energy Class A++
DC inverter compressor modulates output to match real-time heating demand, delivering an inverter COP range of 1.5–16.0 across the full operating envelope — maintaining high efficiency even at partial loads.
Key Benefits
Engineering & ESG Outcomes
High temperature heat pumps are the enabling technology for buildings that have been excluded from decarbonisation by the limitations of standard heat pump offerings. These are the outcomes we consistently deliver for clients.
Direct Legacy System Compatibility
Delivers 80–85°C outlet temperatures matching existing high-temperature emitter systems — cast-iron radiators, fan coils, and older district heating networks. No forced emitter or pipework replacement in most commercial retrofit cases. The single most significant cost saving in legacy building decarbonisation.
Verified Carbon Reduction at COP 2.33
At rated conditions (7°C ambient, 80°C outlet), the system delivers a confirmed COP of 2.33 — meaning each kWh of electricity input produces 2.33 kWh of heat. At current UK grid carbon intensity, this represents a substantial carbon reduction versus gas combustion, improving further as the grid decarbonises.
BESS + Supercapacitor — DNO Cost Avoided
TI's integrated battery energy storage and supercapacitor technology manages peak electrical demand, allowing the system to operate within existing grid connection capacity. Avoids DNO upgrade costs of £100k–£500k+ that routinely make heat pump business cases unviable on commercial sites.
A++ Energy Class, DC Inverter
Automatic defrost, high/low pressure protection and full auto operation come as standard — engineered for unattended, continuous operation in commercial and public sector plant rooms.
Full BMS & IoT Integration
MODBUS RS485 connectivity for direct BMS integration. Smart WiFi app control, centralised web IoT platform, and multi-site monitoring capability. Built-in disinfection function (thermal pasteurisation) for ACOP L8 legionella compliance — eliminating the need for a separate DHW heating system.
Technical Features
System Specification Overview
| Feature | Specification | Engineering Note |
|---|---|---|
| Max. Water Outlet | 80°C – 85°C | Direct replacement for legacy high-temperature distribution systems. No emitter replacement required in most commercial retrofit scenarios. |
| Capacity Range | 15 – 450 kW | Single-unit range. Larger capacity via cascade/modular configurations. Reference model (FEIHHD300T3): rated 140 kW at 20°C ambient, 80°C outlet. |
| Compression | DC Inverter, Two-Stage | Two-stage cascade compression required to achieve high thermal lift efficiently. DC inverter compressor modulates output in real time to match heating demand, maintaining efficiency across partial loads. |
| Refrigerant Circuit | R32/R410A + R134A/R515B | Dual refrigerant cascade: first-stage R32/R410A, second-stage R134A/R515B. Staged circuit achieves high lift while maintaining A++ energy classification. |
| Min. Operating Ambient | –15°C | Confirmed cold-climate operating capability. Automatic defrost function. High and low pressure sensor protection with full auto-restart. |
| Power Supply | 380V / 3-phase / 50Hz | 50 Hz or 60 Hz available. Three-phase supply required. Maximum current input 130.1 A (reference 145 kW model). BESS integration manages peak draw within existing connection capacity. |
| Energy Classification | A++ (Inverter) | CE and RoHS certified. Meets current EU and UK energy efficiency and safety standards. |
| Heat Exchanger | Golden Finned + Tube-in-Shell | Corrosion-resistant golden fin coating on air-side heat exchanger. Tube-in-shell design on water circuit for durability and ease of maintenance. |
| Sound Level | 68 dB(A) | Measured at 1 m, reference model. Acoustic screening may be required on noise-sensitive sites. Site assessment confirms planning compliance. |
| Controls & Connectivity | MODBUS / WiFi / Web IoT | MODBUS RS485 for BMS integration. Smart WiFi app control. Centralised web IoT platform for multi-site monitoring. Disinfection function (thermal pasteurisation) built in. |
Applications
Typical Deployment Contexts
High temperature heat pumps are specified where legacy infrastructure, building fabric constraints, or technical operating requirements rule out conventional alternatives.
Pre-2000 Schools & Colleges
The majority of UK school estate uses high-temperature heating systems. Public Sector Decarbonisation Scheme (PSDS) funding combined with HT heat pumps delivers decarbonisation without full system replacement.
NHS & Healthcare Estates
High domestic hot water demand (above 60°C for legionella control) and legacy heating plant. HT heat pumps are the primary pathway for NHS Net Zero estates targets.
Commercial Offices (Pre-2000)
Large commercial assets with high-temperature fan coil units or perimeter heating that would require full system replacement to accommodate a standard heat pump.
Hotels & Hospitality
DHW demand at 60°C+ for ACOP L8 compliance, combined with high-temperature radiator systems in older stock, creates a natural fit for HT specification.
Social Housing Estates
Block-level decarbonisation for housing associations with legacy communal heating. Decarbonisation funded through Social Housing Decarbonisation Fund.
Industrial Process Heat
Low-temperature process heat requirements (drying, washing, pasteurisation) below 90°C are addressable with CO₂ or ammonia HT heat pump systems in place of gas-fired boilers.
System Integration
The TI Integrated Approach
The single largest barrier to HT heat pump adoption in commercial buildings is not the technology itself — it is the electrical infrastructure constraint. TI’s approach solves this by design.
1
Power Audit
Existing connection capacity confirmed. HT heat pump load profile modelled against available grid headroom.
2
BESS Sizing
Battery storage sized to absorb off-peak grid electricity, eliminating peak demand spikes that trigger DNO upgrade requirements.
3
Ultra HT Heat Pump
FEIHHD300T3 delivers 80–85°C to legacy distribution. DC inverter modulates to load. Gas boiler decommissioned or staged out.
4
Solar PV + Control
On-site generation charges battery and reduces grid import. Smart control layer manages all assets in coordination.
✓
Gas-Free Heating
No DNO upgrade required. No emitter replacement. No gas supply. Full carbon reporting and M&V delivered.
Performance Data
Verified Performance
Reference Model
The table below shows confirmed performance data for the FEIHHD300T3 — TI’s 145 kW reference unit — at 80°C water outlet temperature across a range of ambient operating conditions. This data is drawn directly from the product specification sheet.
Power supply: 380V / 3-phase / 50Hz. Water flow: 23.22 m³/h. Max water outlet: 80°C. Sound level: 68 dB(A). Waterproof: IPX4.
| Operating Condition | Heating Capacity | Power Input | COP |
|---|---|---|---|
| Ambient +20°C / Outlet 80°C | 140 kW | 57.5 kW | 2.43 |
| Ambient +7°C / Outlet 80°C RATED | 130.3 kW | 56.0 kW | 2.33 |
| Ambient –12°C / Outlet 80°C | 101.0 kW | 51.0 kW | 1.98 |
| Ambient –20°C / Outlet 80°C | 89.4 kW | 51.5 kW | 1.74 |
| Operating Condition | Heating Capacity | Power Input | COP |
|---|---|---|---|
| Ambient +20°C / Outlet 80°C | 140 kW | 57.5 kW | 2.43 |
| Ambient +7°C / Outlet 80°C RATED | 130.3 kW | 56.0 kW | 2.33 |
| Ambient –12°C / Outlet 80°C | 101.0 kW | 51.0 kW | 1.98 |
| Ambient –20°C / Outlet 80°C | 89.4 kW | 51.5 kW | 1.74 |
2.33
Rated COP
At +7°C ambient, 80°C outlet — standard UK design condition.
Up to 85°C
Max Outlet Temp
Verified performance data shown is for 80°C outlet, the standard UK design condition.
15–450 kW
Capacity Range
Single unit. Cascade configurations for larger loads available.
£10–75K
Indicative Price
Subject to capacity, configuration, and site requirements. Request a quote for project-specific pricing.
Ready to specify or request a quote?
Our engineering team provides no-obligation feasibility assessments covering technical viability, grid capacity, carbon savings, and investment return. Indicative pricing from £10–75K depending on capacity and configuration.
