💧 Monitair 75 Through-Wall Dehumidifier with Defrost & LPHW Air Heating (Single Phase) | DH75AX/TL

Transform your indoor pool environment with professional-grade humidity control and efficient heating in one space-saving unit

Complete Climate Control for Indoor Swimming Pools

The Monitair 75 DH75AX/TL is a professional-grade through-wall dehumidifier specifically engineered for indoor pool environments. This advanced unit combines powerful dehumidification with integrated LPHW (Low Pressure Hot Water) air heating, delivering complete climate control while protecting your building structure from moisture damage.

Perfect for domestic pools, therapy centers, boutique spas, health clubs, and hotel facilities, the Monitair 75 offers exceptional performance with a space-saving through-wall design that keeps the unit outside your pool hall.

✅ Why Choose the Monitair 75 Through-Wall Model?

Space-Saving Through-Wall Design – Install the unit in an adjacent plant room or external space, maximizing your pool hall interior while maintaining optimal performance

Dual Climate Control – Combines 86.4 litres per day dehumidification capacity with 8.9kW LPHW air heating for year-round comfort

Energy Recovery Technology – Recovers 4.7kW of latent heat from moisture and converts it into usable warmth, dramatically reducing heating costs

Built-in Defrost System – Operates reliably down to 5°C, ensuring consistent performance in all conditions

Single Phase Power – Easy installation with standard electrical supply (230V/50Hz)

Structural Protection – Prevents corrosion, mold, and bacteria growth, safeguarding your pool building’s integrity

🎯 Top Features & Benefits

Energy Recovery Heating

Captures latent energy from moisture and transforms it into heat, providing 4.7kW of free heating while dehumidifying your pool hall

LPHW Air Heating System

Delivers an additional 8.9kW of efficient, even warmth throughout your pool area via Low Pressure Hot Water integration with your existing boiler

Maximum Dehumidification Capacity

Removes up to 3.6 litres per hour or 86.4 litres per day of moisture, maintaining ideal humidity levels between 20-80% RH

Through-Wall Installation

Unit mounts outside the pool hall with decorative supply and intake grilles inside, preserving aesthetics and maximizing usable space

Advanced Defrost Operation

Standard defrost system allows reliable operation in temperatures as low as 5°C, perfect for year-round use

Low Noise Operation

Operates at just 48.5 dB(A) at 3 meters – quieter than normal conversation, ensuring a peaceful pool environment

Variable Humidistat Control

Adjustable humidity control from 20% to 80% RH allows you to maintain perfect conditions for comfort and building protection

📊 Complete Technical Specifications

Dehumidification Performance

Specification	Value
Model Number	DH75AX/TL
Dehumidification Capacity	3.6 L/hr (86.4 L/day)
Air Flow Rate	1,180 m³/hr
Humidity Control Range	20% – 80% RH (adjustable)
Condensate Drain Connection	15mm
Operating Temperature Range	Down to 5°C (with defrost)
Refrigerant Type	R407C (ozone friendly)

Heating Performance

Specification	Value
Heat Recovery (from dehumidification)	4.7 kW
LPHW Air Heating Output	8.9 kW
Total Heat to Air (Combined)	11.3 kW
LPHW Supply Temperature	80°C
LPHW Flow Rate	9.6 L/min
LPHW Connections	22mm copper stub
LPHW Pressure Drop	2.8 m head

Electrical Specifications (Single Phase)

Specification	Value
Electrical Supply	230V / 50Hz Single Phase
Nominal Power Consumption	1.46 kW
Nominal Running Current	6.4 Amps
Full Load Amps (FLA)	7.8 Amps
Compressor LRA	55 Amps
Required Fuse Rating	13 Amp (motor rated)

Physical Dimensions – Through Wall Model

Specification	Measurement
Width (unpacked)	1,474 mm
Height to top duct	1,167 mm
Depth	350 mm
Weight (unpacked)	153 kg
Noise Level @ 3m	48.5 dB(A)

Installation Requirements

Specification	Detail
Installation Type	Through wall (TTW) – external mounting
Wall Penetration	Two holes required (supply & intake)
Supplied Components	Decorative grilles, wall brackets, duct sleeves
Boiler Connection	Required for LPHW heating function
Air Thermostat	Included with unit

Performance figures based on air at 30°C/60% RH and pool water at 28°C with boiler water at 80°C

🏊 Room Size & Coverage Guide

Ideal Pool Hall Applications

The Monitair 75 is perfectly sized for:

Domestic Indoor Pools

• Pool sizes: 4m x 8m to 6m x 12m (32m² – 72m²)
• Pool hall volumes: 150m³ – 350m³
• Typical ceiling height: 2.5m – 4m

Small Commercial Facilities

• Therapy pools and rehabilitation centers
• Boutique hotel spas
• Private health clubs
• Hydrotherapy facilities
• Small leisure centers

Pool Hall Temperature Requirements

• Maintains comfortable temperatures: 28°C – 30°C
• Prevents condensation on walls and glazing
• Creates warm, dry swimming environment

Coverage Capacity Table

Pool Size	Pool Hall Volume	Recommended Model	Dehumidification Time*
4m x 8m (32m²)	150m³	✅ Monitair 75	8-12 hours initial
5m x 10m (50m²)	200m³	✅ Monitair 75	10-14 hours initial
6m x 12m (72m²)	300m³	✅ Monitair 75	14-18 hours initial
7m x 14m (98m²)	400m³	Consider Monitair 110	–

*Initial dehumidification time from high humidity (70%+) to optimal (50-60%). Ongoing operation maintains conditions continuously.

⏱ Real-World Performance Data

Estimated Dehumidification Times

The time required to reduce humidity depends on several factors including starting humidity levels, pool hall volume, temperature, and ventilation. Below are realistic estimates:

Starting Conditions: 70% RH → Target: 55% RH

Pool Hall Volume	Estimated Time	Conditions
150m³	8-12 hours	Pool covered, good insulation
200m³	12-16 hours	Pool covered, good insulation
300m³	18-24 hours	Pool covered, good insulation
350m³	24-30 hours	Pool covered, good insulation

Factors That Affect Performance:

• Pool cover usage (reduces evaporation by 60-70%)
• Pool water temperature (higher = more evaporation)
• Number of swimmers
• Ventilation rates
• Building insulation quality
• External temperature and humidity

⚠ Important: These are estimates for guidance only. Actual performance will vary based on your specific conditions. Continuous operation maintains optimal humidity once achieved.

💰 Running Cost Analysis

Energy Efficiency Benefits

Heat Recovery Savings The Monitair 75 recovers 4.7kW of “free” heat from moisture removal, reducing your boiler demand significantly

Combined Heating Output

• Heat recovery: 4.7kW (free from dehumidification)
• LPHW heating: 8.9kW (from your boiler)
• Total heating: 11.3kW with only 1.46kW electrical consumption

Estimated Running Costs (based on typical UK energy rates)

Operating Mode	Hours/Day	Electricity Cost/Day*	Annual Cost*
Continuous (24/7)	24	£1.05	£383
Pool in Use (12hrs)	12	£0.52	£190
Seasonal (6 months)	12	£0.52	£95

*Based on electricity at 30p per kWh. Actual costs vary with usage patterns and local rates.

LPHW Boiler Operating Costs (additional) The LPHW heating requires boiler operation. Recommended boiler output: 8.9kW minimum

Comparison vs. Alternative Heating Methods:

Method	Typical Cost	Humidity Control	Building Protection
Monitair 75 with LPHW	££	✅ Excellent	✅ Excellent
Electric Heaters Only	£££	❌ None	❌ Poor
Ventilation Only	££££	⚠ Partial	⚠ Moderate
No Climate Control	£ heating	❌ None	❌ Very Poor

💡 Key Benefit: While the Monitair 75 has an upfront cost, it prevents expensive building repairs from moisture damage and reduces long-term heating costs through energy recovery.

🔧 Installation & Placement Guidelines

Through-Wall Installation Requirements

Wall Penetration Details

• Two rectangular holes required in external wall
• Supply grille opening: 342mm x 260mm
• Intake grille opening: 138mm x 988mm
• Wall thickness: Suitable for standard cavity walls (275mm+)

Clearance Requirements

• Front access space: 600mm minimum for filter maintenance
• Top clearance: 200mm minimum for airflow
• Side clearance: 150mm minimum each side
• Rear access: Full access required in plant room for servicing

Optimal Placement ✅ Install in adjacent plant room or external utility space ✅ Position supply grille to distribute air across pool surface ✅ Locate intake grille away from doors and windows ✅ Ensure condensate drain can reach waste outlet ✅ Allow easy access to LPHW connections

What’s Included

• Decorative supply and intake grilles for pool hall side
• Wall mounting brackets
• Through-wall duct sleeves
• Built-in air thermostat
• Installation instructions

⚠ Professional Installation Recommended: This unit requires qualified HVAC technician installation, including electrical connection, LPHW plumbing, and wall penetration sealing.

🌡 How It Works: The Science of Pool Hall Climate Control

The Dehumidification Process

1. Air Intake – Warm, humid air from the pool hall is drawn into the unit through the intake grille
2. Moisture Removal – Air passes over cold evaporator coils, condensing moisture into water droplets that drain away
3. Heat Recovery – The refrigeration cycle captures latent heat energy from the moisture (4.7kW)
4. LPHW Heating – Additional heating (8.9kW) is provided by hot water from your boiler flowing through the air heating coil
5. Air Return – Warm, dry air is returned to the pool hall through the supply grille, creating comfortable conditions

Energy Recovery Benefits

Free Heat from Moisture When water vapor condenses, it releases latent heat energy. The Monitair 75 captures this energy and uses it to warm the supply air – essentially turning moisture removal into free heating.

Reduced Boiler Demand By providing 4.7kW of recovered heat, the Monitair 75 reduces how much your boiler needs to work, cutting fuel costs significantly

Year-Round Efficiency

• Winter: Full dehumidification + maximum heating keeps pool hall comfortable
• Summer: Dehumidification + reduced heating prevents stuffiness and condensation
• All Seasons: Protects building structure from moisture damage

❓ Frequently Asked Questions

General Operation

Q: How long does it take to dehumidify my pool hall initially? A: For a typical 200m³ pool hall, expect 12-16 hours to reduce humidity from 70% to 55% RH. This assumes your pool is covered and the building is well-insulated. Once optimal conditions are achieved, the unit maintains them automatically.

Q: Can I run the Monitair 75 without the LPHW heating function? A: Yes, the unit will still provide 4.7kW of heat recovery from dehumidification alone. However, for winter operation, the LPHW heating (8.9kW) is recommended to maintain comfortable temperatures. You’ll need a qualified engineer to connect it to your boiler system.

Q: What humidity level should I maintain in my pool hall? A: The ideal range is 50-60% RH at 28-30°C. This prevents condensation, protects building materials, and ensures swimmer comfort. The Monitair 75’s adjustable humidistat lets you set your preferred level.

Q: Will this work with my existing boiler? A: The Monitair 75 requires a boiler capable of delivering at least 8.9kW output at 80°C via the LPHW system. Most standard domestic boilers are suitable. Flow rate required: 9.6 L/min. Consult your installer to confirm compatibility.

Installation & Space Requirements

Q: How much wall space does the through-wall installation require? A: The unit dimensions are 1,474mm wide x 1,167mm high (to top duct) x 350mm deep. You’ll need two holes in your wall: one for supply air (342mm x 260mm) and one for intake (138mm x 988mm). Decorative grilles cover these openings on the pool hall side.

Q: Can I install this myself? A: We strongly recommend professional installation by a qualified HVAC technician. Installation involves electrical work (230V supply), LPHW plumbing connections to your boiler, wall penetration, sealing, and commissioning. Improper installation can void the warranty.

Q: What maintenance is required? A: Regular maintenance includes: cleaning/replacing air filters every 2-4 weeks during heavy use, checking condensate drain quarterly, annual professional service including refrigerant levels, electrical connections, and LPHW system inspection.

Q: Where should the condensate drain go? A: The 15mm condensate drain must connect to a suitable waste outlet. Depending on your installation, this may drain to a nearby floor drain, external soakaway, or pumped to a higher-level drain. Ensure proper drainage to prevent water backup.

Performance & Efficiency

Q: How noisy is the Monitair 75? A: At just 48.5 dB(A) measured at 3 meters, it’s quieter than normal conversation (60 dB). The through-wall design also helps, as the unit itself is located outside the pool hall, further reducing perceived noise.

Q: What happens if the power goes out? A: The unit will stop operating, and humidity will begin to rise. Once power is restored, the unit automatically restarts and works to bring humidity back to the set level. If power outages are common in your area, consider a backup generator for continuous protection.

Q: Will this reduce my heating costs? A: Yes, significantly. The Monitair 75 recovers 4.7kW of free heat from moisture removal, reducing boiler demand. Additionally, by controlling humidity, you’ll need less ventilation, which means less heat loss from bringing in cold outside air. Many users report 30-50% heating cost reductions.

Q: Does it work in winter when temperatures drop? A: Absolutely. The built-in defrost system allows operation down to 5°C, ensuring reliable performance year-round. The LPHW heating provides ample warmth even in coldest conditions.

Building Protection

Q: How does this protect my building from moisture damage? A: By maintaining optimal humidity (50-60% RH), the Monitair 75 prevents: condensation on walls and glazing, corrosion of metal structures, timber rot and warping, mold and bacteria growth, paint and plaster deterioration. This protection extends your building’s lifespan significantly.

Q: I have large windows in my pool hall. Will this prevent condensation on the glass? A: The Monitair 75 significantly reduces condensation by controlling humidity levels. However, with large glazed areas, you may still experience some condensation in very cold weather. For best results: use double or triple glazing, direct the supply air toward windows, maintain consistent temperature, consider window heating or dehumidification curtains.

Q: Can I use this with a pool cover? A: Yes, and we highly recommend it! A pool cover reduces evaporation by 60-70%, dramatically improving the Monitair 75’s efficiency and reducing running costs. Use the cover whenever the pool is not in use.

📥 Downloads & Technical Documentation

Product Documentation

📄 Monitair 110 Technical Datasheet (opens in new tab) Complete technical specifications, dimensional drawings, and installation diagrams for the Monitair model range. Includes through-wall installation details and sectional views.

📄 Vaporex and Monitair Product Brochure 2022 (opens in new tab) Comprehensive brochure covering the complete Monitair dehumidifier range including DH75AX/TL specifications, performance data, electrical requirements, and model comparisons. Essential reading for product selection and specification.

📄 Guidelines to Pool Hall Construction 2022 (opens in new tab) Professional guidance on pool hall design, humidity control requirements, construction materials, vapor barriers, insulation, and best practices for creating a durable, moisture-resistant pool environment. Invaluable for new construction or renovation projects.

✅ Why Buy From Parts4Tubs?

Authorized Certikin Dealer We supply genuine Certikin Monitair products with full manufacturer’s warranty

Expert Technical Support Our team has extensive experience with pool hall climate control and can help you choose the right solution

Professional Installation Network We can recommend qualified installers in your area

Competitive Pricing Get professional equipment at competitive prices with excellent customer service

Fast UK Delivery Quick dispatch on in-stock items with tracking

🎯 Perfect For

✅ Domestic indoor swimming pools

✅ Therapy and rehabilitation pools

✅ Boutique hotel spas

✅ Private health clubs

✅ Hydrotherapy facilities

✅ Small leisure centers

✅ Pool halls where space is limited

✅ Facilities requiring external equipment placement

📞 Need Help Choosing?

Not sure if the Monitair 75 is right for your pool? Our expert team can help you:

• Calculate the correct dehumidifier size for your pool hall
• Assess your heating requirements
• Discuss installation options and requirements
• Provide detailed quotations
• Recommend qualified local installers

Contact us today for personalized advice on creating the perfect indoor pool environment.

Important Disclaimers

⚠ Professional Installation Required: This equipment must be installed by qualified HVAC technicians with appropriate electrical and plumbing certifications. Improper installation voids warranty.

⚠ Performance Estimates: All dehumidification times, coverage areas, and running costs are estimates based on typical conditions. Actual performance varies depending on pool hall size, insulation, pool cover usage, water temperature, number of swimmers, ventilation rates, and local climate.

⚠ Boiler Compatibility: LPHW heating function requires compatible boiler system. Consult your installer to verify compatibility before purchase.

⚠ Building Regulations: Pool hall construction and equipment installation must comply with local building regulations and planning requirements. Consult your local authority.

The DH75AX/TL Monitair 75 Through-Wall Dehumidifier represents the professional standard in pool hall climate control – combining powerful dehumidification, efficient heating, and building protection in one expertly engineered unit. Invest in the longevity of your pool facility and the comfort of your swimmers with this state-of-the-art solution.