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Industry: High-Rise Residential

Hot Water Infrastructure
for Residential Towers

High-rise apartments require centralised plant that delivers consistent hot water to every floor, handles simultaneous morning peak loads, and operates efficiently within constrained rooftop or basement plant rooms.

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Why High-Rise Is Different

Vertical Distribution.
Space Constraints.

Residential towers present unique engineering challenges: long vertical distribution runs, confined plant rooms, simultaneous peak demand across hundreds of units, and the need for quiet, maintenance-friendly equipment.

Vertical Distribution

Delivering consistent temperature and pressure across 20, 30 or 40+ floors requires carefully designed risers, pressure zones and return circuits to prevent dead-legs and temperature drop-off.

Simultaneous Peak Demand

Morning shower peaks can draw enormous volumes simultaneously. Storage and generation capacity must be sized to handle design-day peaks without temperature loss at the furthest apartments.

Plant Room Space

Rooftop and basement plant rooms in residential towers are typically constrained. THERMOCUBE's flat-panel design maximises storage capacity per square metre of floor area and can be assembled on-site.

Acoustic Performance

Residents expect quiet operation. Heat pump selection, vibration isolation and plant room acoustic treatment must be considered from the outset to meet residential noise standards.

Energy Efficiency

Heat recovery from VRV/chiller condenser systems combined with heat pump generation significantly reduces energy costs. These hybrid systems can recover waste heat that would otherwise be rejected to atmosphere.

Maintainability

Body corporate and facilities teams need accessible, well-documented systems. Clear isolation points, logical labelling and straightforward service procedures reduce long-term maintenance costs.

Recommended System Architecture

Heat Recovery & Heat Pump
Centralised Plant

High-rise residential systems leverage heat recovery from building cooling systems alongside dedicated heat pump generation, feeding into THERMOCUBE storage for distribution via pressurised risers.

Heat Recovery
VRV / Chiller Condenser
→
Heat Pumps
High-Temp R134a
→
THERMOCUBE
Multi-Tank Array
→
Pressurised Risers
Zoned by Floor

Heat Recovery: In buildings with centralised cooling, condenser heat that would normally be rejected can be captured and redirected to pre-heat the DHW system. This recovered energy is essentially free, reducing heat pump run-time and operating costs significantly.

Pressure Management

THERMOCUBE delivers potable water at regulated mains pressure through internal heat exchangers, eliminating the need for separate pressurisation sets in many installations.

On-Site Assembly

THERMOCUBE tanks are delivered flat-packed and assembled in position, overcoming access constraints in rooftop and basement plant rooms where traditional cylindrical tanks cannot reach.

Temperature Control

High-temperature heat pumps deliver water above 60 degrees C, improving system sanitation and guaranteeing comfort levels throughout extensive distribution networks.

System Components

Equipment Specified
for Residential Towers

Heat Pumps

Combination of water to water and air to water heat pump systems providing the best use of available energy and space saving.

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THERMOCUBE Storage

Flat-panel storage vessels designed for constrained rooftop and basement plant rooms. On-site assembly.

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Booster Pump Sets

Pressurised hot and cold water distribution for multi-storey delivery at consistent flow rates.

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Solar Pre-Heat

Rooftop solar thermal arrays to offset heat pump load and reduce long-term operating costs.

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Residential Projects

Proven Across
South Africa's Tallest Towers

16 on Bree Cape Town, 36-floor residential tower hot water by SIRAC
Cape Town CBD
36 Floors
Cape Town's Tallest Residential Tower

16 on Bree

SIRAC supplied and installed the THERMOCUBE hot water heat accumulators providing all hot water storage for Cape Town's tallest residential tower. Heat recovery systems with four 11,000L THERMOCUBE units supply the entire building.

Towers Main residential high-rise tower in Johannesburg CBD redeveloped by Divercity
Johannesburg CBD
42,000 L
Total THERMOCUBE Storage

Towers Main

Inner-city revival project in partnership with WSP Johannesburg. Two 15,500L and one 11,000L THERMOCUBE accumulators with six 62kW high-temperature heat pumps. Flat-panel tanks were delivered and constructed on-site to overcome tight-quarters access. Divercity has since taken transfer of Towers Main, with redevelopment set to begin.

All Projects
Engineering Considerations

For Consultants
& Developers

Key technical decisions that shape high-rise residential DHW system design.

Per-Unit Demand & Diversity

Residential demand is calculated per apartment type (studio, 1-bed, 2-bed, penthouse) with diversity factors applied for simultaneous use. SIRAC models design-day profiles based on unit mix and expected occupancy patterns.

Heat Recovery Integration

Buildings with centralised VRV or chiller systems offer significant heat recovery potential. Condenser heat that would be rejected to atmosphere is captured and redirected to pre-heat the DHW system, reducing generation costs.

Riser Design & Pressure Zoning

Vertical distribution beyond 10 floors typically requires pressure zoning. SIRAC coordinates riser design with the hydraulic consultant to ensure consistent delivery temperature and pressure at every floor level.

Access & On-Site Assembly

THERMOCUBE's modular flat-panel construction allows delivery through standard doorways and assembly in position. This overcomes the common problem of cylindrical tanks being too large to fit through building access routes.

Technical Specification Sheets

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

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Start Your Project

Send Us Your Unit Mix
& Floor Count.
We'll Propose a System

Our engineers will review your brief and return a recommended architecture, equipment schedule and plant room layout within 48 hours.

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