💧 Monitair 110 Through-Wall Swimming Pool Dehumidifier with Defrost (DH110AX/T)

Professional-Grade Humidity Control for Indoor Swimming Pools | Space-Saving Through-Wall Design | Advanced Energy Recovery Technology

Transform your indoor swimming pool environment with the Monitair 110 DH110AX/T – a powerful through-wall dehumidifier specifically engineered for demanding pool applications. Whether you manage a domestic pool, therapy center, health club, or hotel spa facility, this unit delivers exceptional moisture control while recovering energy and protecting your building’s structural integrity.

Why Choose the Monitair 110 Through-Wall Dehumidifier?

🏊 Purpose-Built for Swimming Pool Environments

Unlike standard domestic dehumidifiers, the Monitair 110 is specifically designed to handle the extreme humidity levels found in indoor pool halls. It removes 4.5 liters of moisture per hour (108 liters per day), keeping your pool area comfortable, safe, and corrosion-free.

💡 Intelligent Energy Recovery Technology

The Monitair 110 doesn’t just remove moisture – it cleverly converts the latent energy contained in water vapor into usable heat. This recovered heat (6.4 kW) is returned to your pool hall, significantly reducing heating costs and creating a warm, dry environment that feels comfortable year-round.

📦 Space-Saving Through-Wall Installation

The through-wall (TTW) configuration allows you to install the dehumidifier outside the pool hall in an adjacent plant room or utility space. This frees up valuable interior space while still providing powerful dehumidification. Decorative grilles maintain aesthetic appeal inside the pool area while the unit works silently behind the scenes.

❄️ Advanced Defrost System (Standard)

Operating reliably down to 5°C, the integrated defrost system ensures consistent performance even during cold winter months when pool halls can experience challenging temperature variations. No performance drop-offs when you need it most.

Key Features & Benefits

✅ High-Capacity Dehumidification: 4.5 L/hr (108 L/day) moisture removal at 29°C/60% RH conditions

✅ Powerful Heat Recovery: 6.4 kW of free heat returned to the pool hall reduces boiler dependency

✅ Through-Wall Mounting: Saves interior space, reduces noise in pool area, easier maintenance access

✅ Automatic Defrost: Standard on all models – maintains performance in temperatures down to 5°C

✅ Single-Phase Operation: Easy electrical installation with standard 230V/50Hz supply

✅ Adjustable Humidistat: Control humidity levels from 20% to 80% RH for precise comfort

✅ Energy Efficient: Only 2.12 kW nominal power consumption with 9.3 amp running current

✅ Quiet Operation: Just 48.5 dB(A) noise level at 3 meters

✅ Compact Through-Wall Design: 1474mm W × 1167mm H × 350mm D

✅ R407C Refrigerant: Ozone-friendly refrigerant for environmental responsibility

✅ 2-Year Manufacturer’s Warranty: Full parts and labor coverage with nationwide service network

Complete Technical Specifications

Specification	DH110AX/T (Through-Wall)
Model Number	DH110AX/T
Installation Type	Through-wall non-ducted
Dehumidification Capacity	4.5 L/hr (108 L/day)
Test Conditions	29°C / 60% RH air, 28°C pool water
Heat Recovery Output	6.4 kW
Air Flow Rate	1180 m³/hr
Defrost System	Standard (operates down to 5°C)
Electrical Supply	230V / 50Hz Single Phase
Nominal Power Consumption	2.12 kW
Nominal Running Current	9.3 Amps
Full Load Amps (FLA)	10.6 Amps
Compressor LRA	66 Amps
Recommended Fuse Rating	16 Amp (motor rated)
Noise Level @ 3m	48.5 dB(A)
Condensate Drain Connection	15mm diameter
Humidistat Range	20% to 80% RH (adjustable)
Refrigerant Type	R407C (ozone friendly)
Weight (Unpacked)	153 kg
Warranty	2 years parts and labor

Through-Wall Model Dimensions

Dimension	Measurement
Width	1474 mm
Height (to top duct)	1167 mm
Depth	350 mm
Supply Grille Position	Front-facing (pool hall side)
Intake Grille Position	Front-facing (pool hall side)
Wall Penetration Required	See installation diagram in spec sheet

Optional Air Heating Facility

Heating Feature	DH110AX/TL (with LPHW)
LPHW Air Heating Output	8.9 kW
Total Heat (Recovery + LPHW)	12.2 kW (15.3 kW maximum available)
LPHW Connections	22mm copper stub
LPHW Flow Rate	9.6 L/min
LPHW Pressure Drop	2.8 m head
Recommended Boiler Output	15 kW
Boiler Supply Temperature	82°C
Built-in Motorized 3-Way Valve	Yes
Air Thermostat	Included

Note: LPHW = Low Pressure Hot Water. This option eliminates the need for separate fan heaters or radiators in the pool hall.

Room Coverage & Suitability Guide

🏊‍♀️ Ideal Pool Hall Applications

The Monitair 110 is perfectly suited for:

✓ Domestic Indoor Pools

• Private residential pools up to 10m × 5m
• Garden room pools and conservatory installations
• Home hydrotherapy pools

✓ Therapy & Rehabilitation Centers

• Hydrotherapy pools
• Medical rehabilitation facilities
• Physiotherapy centers

✓ Health Clubs & Gyms

• Small to medium leisure center pools
• Hotel swimming pools
• Spa facilities

✓ Hotel & Hospitality

• Boutique hotel pools
• Guest house facilities
• B&B swimming pools

📏 Pool Hall Size Recommendations

Pool Hall Volume	Pool Surface Area	Suitability
Up to 400 m³	Up to 50 m²	✅ Excellent
400-500 m³	50-65 m²	✅ Good (monitor humidity)
500-600 m³	65-75 m²	⚠️ Consider DH110 × 2 units or larger model

These are general guidelines. Actual performance depends on pool temperature, air temperature, ventilation rates, pool covers, and bather load.

Real-World Performance Data

💧 Moisture Removal Capacity in Different Conditions

The Monitair 110’s dehumidification capacity varies based on environmental conditions:

Air Temperature	Relative Humidity	Estimated Moisture Removal
28°C	70% RH	~5.0 L/hr
29°C	60% RH	4.5 L/hr (rated)
30°C	55% RH	~4.2 L/hr
26°C	65% RH	~4.0 L/hr

⚠️ Performance estimates based on industry standards. Actual results depend on pool water temperature, air circulation, ventilation rates, and facility-specific factors.

🌡️ Estimated Dehumidification Times

How long will it take to bring a high-humidity pool hall under control?

| Pool Hall Volume | Starting RH | Target RH | Estimated Time | |—|—|—| | 300 m³ | 80% | 60% | 12-16 hours | | 400 m³ | 75% | 60% | 16-20 hours | | 500 m³ | 70% | 55% | 20-28 hours |

⚠️ Important: These are rough estimates assuming continuous operation and no additional moisture input. Initial dehumidification of a newly enclosed pool or after extended periods of high humidity may take longer. Pool covers dramatically reduce dehumidification times.

Energy Efficiency & Running Costs

💰 Cost-Effective Operation

The Monitair 110’s energy recovery technology delivers significant savings:

Heat Recovery Benefits:

• 6.4 kW of free heat recovered from moisture and returned to pool hall
• Reduces boiler running time and fuel consumption
• Minimizes need to introduce and heat cold outdoor air
• Lower carbon footprint compared to ventilation-only systems

Typical Running Costs: Based on 2.12 kW power consumption:

| Usage Pattern | Daily Operating Hours | Weekly Cost (@ £0.24/kWh) | Annual Cost | |—|—|—| | Light Use (Covered Pool) | 6-8 hours | £2.03 – £2.70 | £106 – £141 | | Moderate Use | 10-12 hours | £3.39 – £4.06 | £176 – £212 | | Heavy Use (Uncovered Pool) | 16-20 hours | £5.42 – £6.78 | £282 – £353 |

Electricity costs based on UK average rates as of November 2025. Your actual costs will vary based on your energy tariff and usage patterns.

♻️ Environmental Benefits

✅ Reduces reliance on fossil fuel heating

✅ Ozone-friendly R407C refrigerant

✅ Energy recovery reduces overall energy consumption

✅ Helps achieve building energy efficiency targets

Installation & Clearance Requirements

🔧 Through-Wall Installation Overview

The DH110AX/T is designed for professional installation through an external wall, with the unit mounted in an adjacent plant room or utility space.

Installation Benefits:

• Frees up pool hall floor and wall space
• Reduces noise in swimming area
• Easier access for maintenance and filter cleaning
• Protects unit from splashing and pool chemicals
• Cleaner aesthetic in pool environment

Key Installation Points:

✓ Wall Penetration Required: Two openings for supply and intake air ducts (refer to specification drawings)

✓ Wall Thickness: Suitable for standard cavity walls; sleeves available for thicker walls

✓ Sealing Critical: Machine and ducts must be completely sealed to wall to prevent air recirculation

✓ Cavity Wall Note: If installing against cavity walling, cavities around supply and intake holes must be sealed with non-porous sleeve/board

✓ Condensate Drainage: 15mm drain connection required (gravity or pump to waste)

✓ Electrical Supply: 230V single phase, 16A motor-rated fuse

✓ Clearances: Allow adequate space around unit for airflow and maintenance access (minimum 500mm on service side)

✓ Grilles Included: Decorative supply and intake grilles provided with unit

⚠️ Professional Installation Recommended: Due to through-wall mounting, electrical connections, and condensate drainage requirements, professional installation by qualified technicians is strongly advised.

Why Pool Hall Dehumidification Matters

🏗️ Protect Your Building Investment

Indoor swimming pools generate enormous amounts of moisture through evaporation. Without proper dehumidification:

❌ Structural Damage: Condensation causes corrosion of steel structures, rot in timber, and degradation of building materials

❌ Mold & Bacteria Growth: High humidity creates ideal conditions for mold, mildew, and harmful bacteria

❌ Health Issues: Poor air quality affects swimmers and staff

❌ Uncomfortable Environment: Sticky, clammy conditions reduce enjoyment

❌ Increased Heating Costs: Moisture makes spaces feel colder, requiring more heating

❌ Shortened Building Lifespan: Unchecked moisture causes long-term structural deterioration

✅ Benefits of Proper Humidity Control

The Monitair 110 prevents these problems by maintaining optimal humidity levels (typically 55-60% RH):

✅ Protects building structure and finishes

✅ Prevents corrosion and material degradation

✅ Eliminates mold and bacteria growth

✅ Creates comfortable swimming environment

✅ Reduces heating costs through energy recovery

✅ Extends building lifespan

✅ Improves air quality for swimmers

How the Monitair 110 Works

🔄 Heat Pump Dehumidification Process

1. Warm, Moist Air Intake: Fan draws humid air from the pool hall through the intake grille
2. Cooling & Condensation: Air passes over a cold evaporator coil, causing moisture to condense into water droplets
3. Heat Recovery: The refrigeration cycle captures the latent heat energy from the condensation process
4. Reheating: Dry air is warmed by the condenser coil using recovered energy
5. Warm, Dry Air Return: Heated, dehumidified air is returned to the pool hall through supply grille
6. Condensate Removal: Collected water drains away through 15mm drainage connection

The Result: Lower humidity, warmer temperatures, and significant energy savings compared to ventilation-only systems.

Maintenance & Longevity

🔧 Simple Maintenance Requirements

Weekly/Monthly (User):

• Visual inspection of unit operation
• Check grilles are unobstructed
• Monitor condensate drainage

Every 2-3 Months (User):

• Clean or replace air filters (washable filters behind grilles)
• Check humidity levels are maintained

Annual (Professional Service):

• Full system inspection by qualified engineer
• Refrigerant system check
• Electrical connections inspection
• Deep clean of coils and fans
• Performance testing

2-Year Warranty Included: Full parts and labor coverage with nationwide service network support.

Frequently Asked Questions

❓ What size pool hall can the Monitair 110 handle?

The DH110AX/T is ideal for pool halls up to approximately 400-500 m³ volume (roughly 50-65 m² pool surface area). Actual capacity depends on numerous factors including pool temperature, bather load, ventilation, and whether you use a pool cover. For larger facilities, multiple units or a larger model may be required.

❓ Can I install this unit myself?

While technically-minded individuals could potentially install the standard wall-mounted version, the through-wall model requires professional installation. This involves cutting wall openings, mounting the unit securely, sealing ducts properly to prevent air recirculation, connecting electrical supply (230V), and setting up condensate drainage. Poor installation can lead to performance issues, building damage, and safety hazards. We strongly recommend using qualified pool engineers or HVAC technicians.

❓ How much noise does the Monitair 110 make?

At just 48.5 dB(A) at 3 meters, the Monitair 110 is relatively quiet – comparable to a quiet conversation or background office noise. The through-wall configuration significantly reduces perceived noise in the pool hall since the main unit is located in the adjacent plant room, with only air grilles visible in the pool area.

❓ Do I need the LPHW air heating option?

The LPHW (Low Pressure Hot Water) option adds 8.9 kW of supplementary heating to the pool hall, which can eliminate the need for separate radiators or fan heaters. Consider this option if:

✅ Your pool hall needs additional heating beyond what the 6.4 kW heat recovery provides

✅ You have an existing boiler system that can supply 82°C hot water

✅ You want an integrated heating and dehumidification solution

✅ Your pool hall has significant heat loss (large glazed areas, poor insulation)

If your pool hall is well-insulated and the recovered heat is sufficient, the standard model without LPHW may be adequate.

❓ What’s the difference between through-wall and wall-mounted models?

Through-Wall (TTW) Models:

• Unit installed in adjacent plant room/utility space
• Takes up no pool hall interior space
• Quieter in pool area
• Easier maintenance access from outside
• Grilles visible in pool hall (supply and intake)
• Requires wall penetration

Wall-Mounted Models:

• Unit mounted on pool hall interior wall
• More visible in pool environment
• Slightly louder in pool area
• No wall penetration required
• Maintenance conducted inside pool hall

Through-wall is preferred for new builds or where plant room space is available and interior space is premium.

❓ How does the defrost system work?

When the evaporator coil temperature drops below freezing (common in cooler conditions), ice can form and reduce efficiency. The automatic defrost system periodically reverses the refrigeration cycle or uses electric heating to melt any ice buildup, ensuring consistent moisture removal even when operating down to 5°C. This happens automatically without user intervention.

❓ What humidity level should I maintain in my pool hall?

Industry best practice recommends maintaining pool hall humidity between 55-60% RH for optimal comfort and building protection. Lower humidity (below 50%) can feel dry and uncomfortable; higher humidity (above 65%) increases condensation risk and building damage. The Monitair 110’s adjustable humidistat (20-80% RH range) allows you to set your preferred level.

❓ Can this unit cool my pool hall in summer?

The Monitair 110 is a dehumidifier with heat recovery, not an air conditioning unit. While it removes moisture and provides dehumidification year-round, it adds heat to the space (6.4 kW from heat recovery). In summer, you may need to combine the dehumidifier with ventilation or a separate cooling system to prevent overheating, particularly in conservatory-style pool buildings with high solar gain.

❓ How long does the unit take to dry out a very humid pool hall initially?

Initial dehumidification of a newly commissioned pool or a pool hall that’s been left unchecked can take 24-48 hours or more to bring humidity from 80%+ down to target levels (55-60% RH). Ongoing operation to maintain these levels is much less demanding. Using a pool cover when the pool isn’t in use dramatically speeds up this process and reduces the dehumidifier’s workload.

❓ Is a pool cover necessary with this dehumidifier?

A pool cover is highly recommended but not absolutely mandatory. An uncovered pool can evaporate 50-70% more water than a covered pool, which means:

Without Cover:

• Dehumidifier runs longer hours
• Higher electricity costs
• More moisture to remove
• Potentially insufficient capacity for very large pools

With Cover:

• Dramatically reduced evaporation (up to 70% less)
• Lower running costs
• Dehumidifier operates more efficiently
• Easier to maintain target humidity levels
• Faster heat-up times and reduced heat loss from pool water

For best results and lowest operating costs, use a pool cover when the pool isn’t in use.

❓ What maintenance does the Monitair 110 require?

Regular maintenance is minimal:

✓ Clean/replace washable air filters every 2-3 months (behind grilles – easy access) ✓ Ensure condensate drain isn’t blocked ✓ Check grilles remain unobstructed ✓ Annual professional service recommended

The unit is designed for reliable, low-maintenance operation. Most maintenance tasks can be performed by the user, though annual professional servicing ensures optimal performance and longevity. The 2-year parts and labor warranty provides additional peace of mind.

❓ What happens if there’s a power cut or breakdown?

During extended power outages or equipment failures, humidity in the pool hall will rise rapidly – potentially reaching saturation (100% RH) and causing condensation on all cold surfaces. This is why the building fabric must be specified for “exterior-grade” materials that can withstand occasional exposure to saturated air without deteriorating. Always ensure electrical supply is reliable and consider the unit’s installation location allows for quick maintenance access.

📥 Downloads & Documentation

📄 Monitair 110 Technical Specification Sheet (opens in new tab) Complete technical specifications, dimensional drawings, installation diagrams for both standard and through-wall models. Includes wiring requirements and plumbing connections.

📄 Vaporex & Monitair Product Brochure 2022 (opens in new tab) Full range catalog featuring all Calorex Monitair dehumidifiers with detailed performance data, model comparisons, and application guidance for domestic and commercial pools.

📄 Guidelines to Pool Hall Construction 2022 (opens in new tab) Essential guidance on pool hall design, construction materials, vapor barriers, insulation, and moisture control strategies. Recommended reading for anyone building or refurbishing an indoor pool facility.

Make the Smart Investment in Your Pool Environment

The Monitair 110 DH110AX/T Through-Wall Dehumidifier represents a professional solution to pool hall humidity control, combining powerful dehumidification with intelligent energy recovery in a space-saving through-wall format.

What You Get:

✅ 4.5 L/hr moisture removal capacity (108 L/day)

✅ 6.4 kW of recovered heat reduces heating bills

✅ Through-wall installation frees interior space

✅ Advanced defrost system for year-round operation

✅ Quiet operation (48.5 dB at 3m)

✅ Single-phase power (230V) – easy installation

✅ Adjustable humidity control (20-80% RH)

✅ 2-year parts & labor warranty

✅ Proven reliability in demanding pool environments

Protect Your Investment

Your indoor pool building represents a significant investment. Proper humidity control isn’t optional – it’s essential for:

🏗️ Structural preservation – prevent corrosion, mold, and material degradation 💰 Energy savings – recover free heat from moisture 🌡️ Comfort – maintain ideal swimming conditions year-round 🏊 Health – ensure clean, fresh air quality ⏰ Longevity – extend your building’s lifespan

Transform your indoor pool environment today with the Monitair 110. Experience superior humidity control, energy efficiency, and lasting building protection.