BathSelect Imperial Spa Shower Systems – Engineering Specification and Design Requirements
Shower Systems | Thermostatic Engineering | Hydraulic Performance | Spa Grade
BathSelect Imperial Spa Shower Systems: Engineering Design, Hydraulic Performance, and Specification Requirements
The Imperial Spa collection represents the pinnacle of thermostatic shower engineering, combining ASSE 1016 certified valves with precision hydraulic coordination for luxury commercial spa, hospitality, and residential installations.
Systems integrate:
- • Thermostatic mixing valves (ASSE 1016 certified) with ±1°F temperature stability
- • Multi-function shower panels with integrated diverter systems
- • Rainfall and body spray distribution engineered for hydraulic balance
- • Commercial-grade components tested to 600,000 cycles
- • Full CAD, BIM, and specification documentation
ASSE 1016 Certified
±1°F Stability
Commercial Grade
Solid Brass Construction
BMS Integration Ready
Multi-Outlet Coordination
FIGURE 1.0: Imperial Spa thermostatic valve cross-section - ASSE 1016 certified mixing chamber with integrated check valves and temperature control mechanism.
Hydraulic Engineering and Thermostatic Control
Thermostatic Mixing Performance
Imperial Spa systems use precision thermostatic cartridges designed to maintain temperature stability within ±1°F under simultaneous pressure fluctuations of ±20 psi. Compliant with ASSE 1016 and engineered for commercial spa environments. Response time: <2 seconds under load changes. Anti-scald protection with automatic shut-off on supply failure. Thermal locking at 120°F default with field-adjustable limit stops.
Multi-Outlet Hydraulic Coordination
Systems coordinate flow between rainfall heads (1.8–2.5 GPM), body sprays (1.5 GPM each), and hand showers (1.5–1.8 GPM) using engineered diverter valves and volume controls. Hydraulic balancing ensures consistent outlet performance regardless of simultaneous operation. Maximum total flow: 7 GPM for complete systems. Thermostatic valve Cv: 4.5 at 45 psi differential.
Commercial Pressure Compatibility
Engineered to operate optimally between 45 psi – 80 psi dynamic pressure. Supports multi-fixture simultaneous operation in commercial spas, hotels, and fitness facilities. Minimum operating pressure: 30 psi; maximum: 100 psi. Pressure drop ≤5 psi at 7 GPM combined flow. All components tested to 300 psi static pressure and 500 psi hydrostatic burst pressure.
Engineering Diagrams & Technical Visuals
Engineering Design Considerations for Spa and Hospitality Environments
System Configuration Planning
- Exposed Systems: Visible valve and piping, ideal for renovation projects and design-forward applications. Verify rough-in dimensions: 1/2" NPT connections, standard 6" centers for dual-control, 3-1/2" for single-control.
- Concealed Systems: Valves hidden behind wall, only trim visible. Requires rough-in valve bodies installed before wall finish. Minimum wall depth: 3.5". Provide access panels for service.
- Multi-Function Panels: Integrated diverters for rainfall, hand shower, and body sprays. Coordinate panel mounting with wall reinforcement. Panels require 2" x 4" backing at mounting points.
Hydraulic Balancing for Multi-Outlet Systems
- Flow Rate Coordination: Ensure total demand does not exceed valve capacity. Typical configurations: rainfall (2.0 GPM) + 4 body sprays (1.5 GPM each) + hand shower (1.5 GPM) = 8.5 GPM – requires high-capacity valve (IMP-1006-HC, Cv 7.2, 3/4" supply).
- Pressure Drop Analysis: Verify pressure drop across system at design flow rates. Imperial Spa valves engineered for <3 psi drop at rated flow.
- Temperature Stability: Thermostatic valves maintain set temperature ±1°F regardless of outlet sequencing.
Materials and Construction Engineering
Solid Brass Valve Bodies
Precision-machined solid brass (ASTM B283 C37700 forging brass) ensures structural integrity and corrosion resistance. Dezincification-resistant brass (DZR) available for aggressive water conditions. Compliant with NSF 61 Annex G for potable water with lead content ≤0.25% wetted surface average.
Stainless Steel Components
Hoses, panel frames, and mounting hardware: 304 stainless steel (ASTM A240) for maximum durability in high-moisture environments. Corrosion resistance tested to ASTM B368 (500+ hours salt spray). 18/8 construction ensures long-term reliability.
Ceramic Disc Cartridges
Engineered for 600,000+ cycles (commercial grade) with 180°F water at 100 psi impulse testing. Smooth operation, drip-free performance. Replaceable without removing valve body. Compatible with both standard and high-flow applications.
PVD Finishes
Physical Vapor Deposition (PVD) finishes provide superior abrasion and chemical resistance. Available in Brushed Nickel, Matte Black, Polished Chrome, Brushed Gold, Oil-Rubbed Bronze. Tested to ASTM D3363 for hardness (pencil hardness 3H).
Elastomers and Seals
High-temperature EPDM (ASTM D2000 M3CH1010) and PTFE seals ensure long-term reliability in hot water applications (max 180°F). Chlorine-resistant formulations for commercial spa environments.
Check Valves and Backflow Prevention
Integrated check valves on hot and cold inlets prevent crossflow and ensure compliance with plumbing codes. ASSE 1016 certified backflow protection with integral check valves on both inlets.
Code Compliance and Engineering Standards
| Thermostatic Valve Standard | ASSE 1016 – Performance Requirements for Automatic Compensating Valves. Certified for temperature control (±1°F) and anti-scald protection with automatic shut-off on supply failure. |
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| Plumbing Fittings Standard | ASME A112.18.1/CSA B125.1 – Plumbing Supply Fittings. Certified for materials, performance, and durability (600,000 cycle commercial grade). |
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| Accessibility | ADA 2010 Standards where applicable. ADA-compliant lever handles tested to 3.2 lbf maximum operating force (vs. 5 lbf requirement). |
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| Water Efficiency | WaterSense compatible configurations available (1.5 GPM hand showers, 1.8 GPM rainfall heads) with Venturi-effect flow compensation. CALGreen compliance where adopted. |
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| Materials Safety | NSF 61 – Drinking Water System Components. Certified for potable water contact with lead content ≤0.25% wetted surface average. |
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| Backflow Prevention | ASSE 1016 compliant check valves on all inlets. Meets plumbing code requirements for crossflow prevention. |
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| BMS Integration | Digital controls support BACnet MS/TP, Modbus RTU, and 0-10V interfaces with surge protection to IEEE C62.41. |
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| AEC Documentation | CAD, BIM (LOD 350), cut sheets, submittals, and installation manuals included. All documentation available at BathSelect Technical Library. |
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Primary Engineering References
ASSE 1016
ASME A112.18.1
NSF 61
ADA 2010
WaterSense
CALGreen
ASTM B283
ASTM B368
ASTM D3363
BACnet
System Integration and Building Coordination
Rough-In Coordination
- Exposed systems: Standard 1/2" NPT connections. Valve centers: 6" for dual-control, 3-1/2" for single-control.
- Concealed systems: Rough-in valve bodies must be installed before wall finish. Minimum wall depth: 3.5". Provide access panels for service.
- Panel systems: Coordinate mounting with wall reinforcement. Panels require 2" x 4" backing at mounting points.
- Electrical coordination: Low-voltage sensors and digital controls require conduit to junction box.
BMS Integration and Smart Controls
- Digital interfaces: Optional digital thermostatic controls with temperature display and preset programming. BACnet MS/TP (RS-485), Modbus RTU, and 0-10V interfaces available.
- Building Management Systems (BMS): Data points include setpoint temperature, actual temperature, flow rate (GPM), cumulative volume, fault status, and valve position.
- Leak detection: Optional moisture sensors with automatic shut-off integration.
- Water efficiency monitoring: Flow data output available for sustainability reporting and LEED v4 credits.
Technical Specifications – Imperial Spa Shower Systems
| Valve Type | Thermostatic mixing valve (ASSE 1016 certified). Pressure-balance options available for specific configurations. |
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| Temperature Control | ±1°F stability under varying pressure (±20 psi). Adjustable maximum temperature limit (default 120°F/49°C). Anti-scald protection with automatic shut-off. Response time <2 seconds. |
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| Flow Rates | Rainfall heads: 1.8 GPM, 2.0 GPM, 2.5 GPM. Hand showers: 1.5 GPM, 1.8 GPM. Body sprays: 1.5 GPM each. Complete systems: up to 7 GPM total. High-capacity available up to 11.5 GPM. |
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| Pressure Requirements | Optimal: 45–80 psi dynamic. Minimum: 30 psi. Maximum: 100 psi. Pressure drop: ≤5 psi at 7 GPM combined flow. |
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| Cv Values | Thermostatic valve Cv: 4.5 at 45 psi. Diverter valves: Cv 3.2 per outlet. High-capacity valve Cv: 7.2 with 3/4" supply. |
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| Materials | Solid brass valve bodies (ASTM B283), 304 stainless steel hoses and hardware, ceramic disc cartridges, EPDM/PTFE seals. |
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| Finishes | PVD: Brushed Nickel, Matte Black, Polished Chrome, Brushed Gold, Oil-Rubbed Bronze. Tested to ASTM B368 (500+ hours salt spray), ASTM D3363 (pencil hardness 3H). |
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| Connections | 1/2" NPT male inlets and outlets. Optional 3/4" for high-flow configurations. |
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| Durability | 600,000 cycles commercial-grade (ASME A112.18.1). Tested to 300 psi static, 500 psi hydrostatic burst. |
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| BMS Integration | BACnet MS/TP, Modbus RTU, 0-10V analog. Surge protection to IEEE C62.41. |
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| Certifications | ASSE 1016, ASME A112.18.1/CSA B125.1, NSF 61, ADA compliant options, WaterSense available. |
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| Warranty | Limited lifetime (residential), 5-year limited (commercial). |
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Imperial Spa Specification Checklist
Codes & Standards
- ☐ ASSE 1016 certified
- ☐ ASME A112.18.1/CSA B125.1
- ☐ NSF 61 materials
- ☐ ADA compliance (if required)
- ☐ WaterSense flow rates
- ☐ CALGreen (if adopted)
- ☐ BMS integration (BACnet/Modbus)
Hydraulic Design
- ☐ Flow rate calculations
- ☐ Pressure drop verification
- ☐ Multi-outlet coordination
- ☐ Temperature stability (±1°F)
- ☐ Anti-scald protection
- ☐ Cv value verification
- ☐ Crossflow prevention
Installation
- ☐ Rough-in dimensions verified
- ☐ Wall reinforcement coordinated
- ☐ Access panel locations
- ☐ Connection types (1/2" NPT)
- ☐ Water pressure confirmed (45-80 psi)
- ☐ Service access planned
- ☐ BMS wiring requirements
Imperial Spa System Components and Models (20 Total)
The following 20 models represent the complete engineered system components supporting Imperial Spa installations. Each component is engineered for integration into complete shower systems with ASSE 1016 certification and commercial-grade durability.
IMP-1000 – Thermostatic Valve
1/2" connections, integrated volume control, ASSE 1016 certified, Cv 4.5. Available in all finishes. Commercial-grade, 600,000 cycles.
IMP-1001 – Multi-Function Panel
Luxury panel with integrated diverter controls for rainfall, hand shower, and body sprays (up to 6 outlets). Digital interface optional.
IMP-1002 – 12" Rainfall Head
2.0 GPM (1.8 GPM WaterSense available), solid brass, ceiling or wall mount. Even water distribution with self-cleaning silicone nozzles.
IMP-1003 – Hand Shower Set
Luxury hand shower with 60" stainless steel hose (304), multiple spray modes, pause function. 1.5 GPM WaterSense available.
IMP-1004 – Body Spray Jet
Adjustable direction, 1.5 GPM, solid brass construction. Available in single or multi-jet configurations for custom spa walls.
IMP-1005 – Diverter Valve
3-way diverter, 1/2" connections, Cv 3.2 per outlet, for multi-outlet configurations. Ceramic disc technology, 600,000 cycles.
IMP-1006 – Complete Luxury System
Thermostatic valve + 12" rainfall + hand shower + 4 body sprays. Includes diverter and volume controls. 7 GPM capacity.
IMP-1006-HC – High-Capacity System
High-capacity thermostatic valve (Cv 7.2) with 3/4" connections. Supports up to 11.5 GPM for large spa installations.
IMP-1007 – Exposed Shower Set
Exposed thermostatic valve with 10" rainfall head and hand shower. Ideal for renovations and design-forward applications.
IMP-1008 – Concealed Valve Trim
Trim kit for concealed thermostatic valves. Multi-function compatible. Available in all PVD finishes.
IMP-1009 – Luxury Panel System
Complete panel with integrated diverter, 10" rainfall, hand shower, and 4 body sprays. Digital BMS interface optional (BACnet/Modbus).
IMP-1010 – Slide Bar Set
Adjustable 24" slide bar with hand shower, wall mount. Height-adjustable for universal access. ADA compliant (3.2 lbf lever force).
IMP-1011 – Rough-In Valve Body
Rough-in valve body for multi-port concealed systems. Accepts up to 6 outlets. Must be installed before wall finish.
IMP-1012 – Volume Control Trim
Metal lever volume control trim for multi-outlet systems. Interchangeable with temperature trim. 600,000 cycle rated.
IMP-1013 – Temperature Trim
Temperature control trim for thermostatic valves. Includes adjustable limit stop (field adjustable 90°F-115°F).
IMP-1014 – Shower Hose
60" stainless steel shower hose, corrosion-resistant. 304 stainless steel construction with brass fittings.
IMP-1015 – Shower Bracket
Wall mount adjustable shower bracket, solid brass. Tilts for directional adjustment. Available in all finishes.
IMP-1016 – Escutcheon Plate
7" diameter escutcheon plate for concealed installations. Covers rough-in openings. Solid brass with PVD finish.
IMP-1017 – Ceiling Arm
Adjustable drop ceiling arm for rainfall heads. 6-12" adjustable drop. Solid brass with PVD finish.
IMP-1018 – Wall Arm
12" projection wall arm for shower heads. Solid brass, available in all finishes. 1/2" NPT connection.
IMP-1019 – Wall Arm – Extended Variant
Extended projection wall arm for rainfall shower heads. Solid brass construction, commercial-grade durability, compatible with all Imperial Spa systems.
AEC Resources and Specification Support
Technical Documentation Library
Project Coordination
For project-specific submittals, contact specification support with your valve type, panel configuration, finish, and flow requirements. We can provide consolidated documentation packages aligned with your naming conventions and project specifications.
Specification Support: [email protected]
Technical Hotline: 1-800-555-1234 (option 3)
BMS Integration Support: 1-800-555-1234 (option 4)
Engineering FAQ: Technical Specifications & System Design
Technical inquiries for AEC professionals specifying Imperial Spa collections in hospitality, commercial, and luxury residential applications.
What ASSE 1016 certification parameters apply to Imperial Spa thermostatic valves?
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Imperial Spa thermostatic valves are certified to ASSE 1016 with temperature stability of ±1°F under simultaneous pressure variations of ±20 psi. Response time ≤2 seconds. Thermal locking at 120°F default with field-adjustable limit stops down to 90°F for commercial applications. Integral check valves on both inlets prevent crossflow and meet backflow prevention requirements. All valves tested to 600,000 cycles commercial grade.
What are the Cv values and pressure drop characteristics for multi-outlet configurations?
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Thermostatic valve Cv: 4.5 at 45 psi differential. Diverter valves: Cv 3.2 per outlet. Complete systems: total pressure drop ≤5 psi at 7 GPM combined flow. For configurations exceeding 7 GPM (e.g., 2.5 GPM rainfall + 6 body sprays @ 1.5 GPM each = 11.5 GPM), specify IMP-1006-HC high-capacity valve (Cv 7.2) with 3/4" supply connections. Pressure drop calculations available in technical submittals.
Which ASTM material specifications govern Imperial Spa component construction?
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Valve bodies: ASTM B283 C37700 forging brass. Decorative components: ASTM B456 electroplated or PVD per ASTM D3363 (pencil hardness 3H). Stainless steel hoses: ASTM A240 304 (18/8). Elastomers: ASTM D2000 M3CH1010 EPDM. All materials comply with NSF 61 Annex G for lead content ≤0.25% wetted surface average.
How are flow rates regulated for WaterSense compliance while maintaining spray performance?
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WaterSense models utilize precision-engineered flow restrictors with Venturi-effect compensation, maintaining 1.5 GPM ±0.2 GPM across 45-80 psi dynamic range. Spray force is optimized through nozzle geometry: 2.8-3.2 oz-force at 1.5 GPM, equivalent to 2.5 GPM non-compliant models. All WaterSense configurations undergo EPA-certified testing per ASME A112.18.1.
What is the cycle testing protocol for commercial-grade Imperial Spa components?
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Commercial-grade certification requires 500,000 full-stroke cycles per ASME A112.18.1 (vs. 250,000 for residential). Imperial Spa components undergo 600,000 cycles with 180°F water at 100 psi impulse testing. Cartridge endurance: 750,000 cycles at 120°F with 50% duty cycle. All components are tested to 300 psi static pressure and 500 psi hydrostatic burst pressure.
What communication protocols are available for BMS integration?
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Digital Imperial Spa controls support BACnet MS/TP (RS-485), Modbus RTU, and 0-10V analog interfaces. Data points include setpoint temperature, actual temperature, flow rate (GPM), cumulative volume, fault status, and valve position. Optional gateway module enables BACnet/IP integration. All BMS configurations include electrically isolated inputs and surge protection to IEEE C62.41.
How do ADA-compliant configurations address lever force and reach requirements?
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ADA-compliant lever handles require maximum 5 lbf operating force; Imperial Spa ADA configurations tested to 3.2 lbf maximum. Temperature control levers meet ICC A117.1 with ≤270° rotation from off to maximum temperature. Shower controls mounted 38-48" above finish floor with 18" minimum clear floor space. Hand showers include 60" hose and height-adjustable slide bar with positive stop.
What design features address Legionella risk in recirculating systems?
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Imperial Spa thermostatic valves incorporate thermal disinfection capability: manual override to 160°F for 30-minute cycle per ASHRAE Guideline 12-2020. Valve bodies feature full-port design with dead-leg elimination (≤1.5x pipe diameter). All wetted materials support chlorine dioxide and thermal disinfection protocols. Optional thermal purge cycle automates weekly 140°F flush.
What Level of Development (LOD) and parameters are included in Imperial Spa BIM objects?
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Imperial Spa Revit families are authored to LOD 350 with connectors for Autodesk Fabrication (CAMduct). Parameters include flow rate (GPM), pressure drop (calculated), connection size (NPT), Cv values, and clearance requirements. IFC export supports COBie compliance with asset data: model number, warranty start, installation date. Families include 2D schematic representations for single-line diagrams and 3D geometry for coordination.
ENGINEERING SIGNATURE
The BathSelect Imperial Spa Collection is engineered as a coordinated thermostatic shower system platform designed to deliver predictable hydraulic performance, temperature stability, and specification-grade reliability across hospitality, wellness, and luxury residential environments.
Each component integrates into a unified system architecture supporting ASSE 1016 compliance, multi-outlet hydraulic balancing, and long-term operational durability. Complete AEC documentation, BIM integration (LOD 350), and technical submittals ensure seamless coordination across design, engineering, and installation workflows.
SYSTEM STATUS
Specification-Ready
ENGINEERING STANDARD
ASSE 1016 / ASME A112.18.1
AEC INTEGRATION
CAD • BIM (LOD 350) • Submittals
SYSTEM RELIABILITY
Commercial-Grade • 600K Cycles
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The Imperial Spa Collection serves as an engineering-defined reference platform for thermostatic shower system integration. Designed with system-level coordination, each component contributes to hydraulic balance, temperature stability, and operational durability under real-world installation conditions.
Supported by comprehensive technical documentation, BIM assets, and specification resources, Imperial Spa enables precise project coordination and predictable performance across hospitality, wellness, and residential applications requiring engineering-grade plumbing solutions.
ENGINEERING REFERENCE • SPECIFICATION AUTHORITY
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