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Industry: Healthcare

Hot Water Infrastructure
for Healthcare Facilities

Hospitals and medical facilities require uninterrupted supply, strict hygiene compliance and full system redundancy. SIRAC designs centralised systems built to HTM 04-01 and SHTM 04-01 standards.

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Why Healthcare Is Different

Demanding Standards.
Zero Tolerance for Failure.

Healthcare facilities operate under strict statutory and clinical requirements that directly shape every element of a compliant DHW system design.

Reliable High-Volume Supply

Hospitals operate 24/7 with simultaneous demand from wards, theatres, kitchens and patient bathing. Systems must maintain consistent delivery under extreme peak loads.

Legionella Risk Management

HTM 04-01 compliance demands storage at 60°C+, distribution above 50°C and regular thermal disinfection cycles. This requires precise temperature management throughout.

Redundancy & System Resilience

Primary generation and storage must incorporate redundant plant so that maintenance or equipment failure never interrupts patient care or hygiene protocols.

Energy Efficiency & Reporting

NHS Sustainability commitments require demonstrable energy efficiency. Heat pump-led systems with optimised storage deliver significant reductions in both carbon and cost.

Maintainability & Access

Plant room layouts must accommodate routine maintenance without system shutdown. Equipment isolation, clear service access and logical labelling are essential requirements.

Compliance Documentation

Commissioning records, L8 risk assessments, schematic drawings and operating manuals must be produced and maintained for statutory inspection and Estates teams.

Recommended System Architecture

Primary, Backup & Distribution.
Designed for Resilience

Healthcare systems follow a layered architecture: primary heat pump generation, buffer storage, redundant backup plant, and controlled secondary distribution loops.

Primary Heat Pumps
N+1 Redundant Array
→
Buffer Storage
60°C+ / Stratified
→
Backup Plant
Gas Boilers / Immersions
→
Distribution Loops
Zoned, Temp Controlled

Thermal Disinfection Capability: All storage vessels and distribution circuits are configured to support scheduled or triggered pasteurisation cycles, raising temperatures to ≥70°C for statutory Legionella disinfection.

Temperature Control

Storage at 60°C minimum, return circuits above 50°C, PEMV-controlled outlets for patient safety compliance.

Sanitation Strategy

Automated thermal disinfection scheduling with logging, integrated L8 temperature monitoring at all sentinel points.

Resilience Design

N+1 primary generation, duty/standby pumping, zone isolation valves. No single point of failure.

System Components

Equipment Specified
for Healthcare Demands

Heat Pumps

Air and water source systems selected for healthcare-grade output temperatures and reliability.

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Thermal Storage

Buffer and volume tanks with anti-stratification coils and disinfection-grade insulation.

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Pumping & Controls

Variable speed pump assemblies with BMS integration and remote monitoring capability.

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Solar Thermal (Optional)

Pre-heat solar collectors to offset primary heat pump load and reduce energy costs.

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Healthcare Projects

Proven in South African Healthcare

SIRAC THERMOCUBE plant room installation at Milpark Hospital
Healthcare
22,500 L
THERMOCUBE Storage

Milpark Hospital, Johannesburg

In collaboration with Spoormaker & Partners and Airgro, SIRAC supplied and commissioned 3 x 7,500L THERMOCUBE™ Heat Accumulator sets which act as a junction for multiple heat sources — chiller heat recovery and 2 x 100 kW SIRAC High Temperature specific heat pumps.

The THERMOCUBE™ system simply and conveniently connects all aspects of this project together, improving combined efficiency, sanitation and comfort levels.

Sanitation

Indirect Heating for High-Risk Environments

As an indirect heating system, the THERMOCUBE™ Heat Accumulators enhance sanitation of the hot water system. The heated water never leaves the tank. Sanitised fresh mains water, at regulated mains pressure, passes through purpose-made 316L stainless steel heat exchangers suspended into the hot water within the tank, drawing heat from it. This heated, sanitised water is then available for distribution.

This eliminates the threat of Legionella growth in the hot water vessels — making it the ideal solution for higher-risk environments such as hospitals and clinics.

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Engineering Considerations

For Consultants
& Specifiers

Key technical decisions that shape healthcare DHW system design, through to tender documentation.

Sizing Approach & Peak Demand Modelling

Healthcare demand is calculated from occupied bed count, staff numbers, kitchen and theatre flows combined, alongside building-specific occupancy schedules to establish design-day demand profiles.

Redundancy Options & N+1 Design

Primary generation is designed N+1 as standard for healthcare. Storage volume is calculated to buffer peak demand and allow single-unit maintenance without supply interruption. Standby immersion heaters in storage vessels provide ultimate backup.

Plant Room Layout & Service Access

We produce full plant room arrangement drawings coordinated with structural grid, access routes and MEP co-ordination. Maintenance access clearances follow HTM 00 guidance and manufacturer minimum requirements.

Temperature Strategy & Blending

Storage at 60°C, secondary circuits at 55°C flow/50°C return, PEMV-controlled outlets at safe user temperatures. Thermostatic blending valve specifications are detailed in tender documentation for contractor procurement.

Technical Specification Sheets

Access detailed product specifications, performance data and system design parameters for all SIRAC equipment.

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Engineering Tool

Healthcare Hot Water Demand Calculator

Input bed count, occupancy type and usage profiles to generate compliant design-day demand figures.

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Start Your Project

Send Us Your Occupancy &
Constraints.
We'll Propose a System Layout

Our engineers will review your brief and return a recommended architecture, indicative equipment schedule and capacity summary within 48 hours.

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