🌊 Monitair 110 Through-Wall Pool Dehumidifier with LPHW Air Heating – DH110AX/TL

Transform your indoor pool environment with professional-grade climate control that saves space, reduces energy costs, and protects your building investment.

Why Choose the Monitair 110 Through-Wall Dehumidifier?

The DH110AX/TL represents the pinnacle of indoor pool climate management, combining powerful dehumidification, integrated LPHW (Low Pressure Hot Water) air heating, and space-saving through-wall installation. Perfect for domestic pools, therapy centres, health clubs, hotel spas, and leisure facilities, this single-phase unit delivers comprehensive environmental control while maximizing your usable pool hall space.

🏆 Key Benefits at a Glance

✅ Space-Saving Design – Through-wall installation keeps equipment outside the pool hall, maximizing interior space

✅ Dual Climate Control – Dehumidification + LPHW air heating in one integrated system

✅ Energy Recovery Technology – Converts moisture energy into usable heat, significantly reducing running costs

✅ Structural Protection – Prevents corrosion, mold, and moisture damage to your building

✅ Single-Phase Operation – Simple installation with standard 230V electrical supply

✅ Advanced Defrost System – Reliable operation even down to 5°C ambient temperatures

✅ Quiet Operation – Only 48.5 dB(A) at 3 meters – maintains peaceful pool environment

Complete Technical Specifications

Dehumidification Performance

Specification	Value
Model Number	DH110AX/TL
Dehumidification Capacity	4.5 litres/hour
Daily Capacity	108 litres/day
Operating Conditions	29°C / 60% RH (standard rating)
Air Flow Rate	1,180 m³/hr (nominal)
Defrost System	Standard (operates down to 5°C)

Heating Performance

Specification	Value
Heat Recovery (Heat Pump)	6.4 kW
LPHW Air Heating	8.9 kW
Maximum Total Heat Output	12.2 kW (combined)
LPHW Flow Rate	9.6 litres/min
LPHW Connections	22mm copper stub
Recommended Boiler Output	9.6 kW

Electrical Specifications

Specification	Single Phase
Electrical Supply	230V / 50Hz
Nominal Power Consumption	2.12 kW
Nominal Running Current	9.3 Amps
Full Load Amps (FLA)	10.6 Amps
Compressor LRA	66 Amps
Fuse Required	20 Amp (motor rated)

Physical Dimensions – Through-Wall Model

Dimension	Measurement
Width	1,474 mm
Height (to top duct)	980 mm
Depth	350 mm
Weight (unpacked)	153 kg
Condensate Drain	15mm diameter stub

Installation Clearances

Opening	Size
Supply Grille Opening	988mm (W) x 342mm (H)
Intake Grille Opening	888mm (W) x 260mm (H)

Environmental Performance

Specification	Value
Noise Level	48.5 dB(A) @ 3 meters
Refrigerant Type	R407C (ozone-friendly)
Humidity Control Range	20% to 80% RH (adjustable)

Outstanding Features & Benefits

💡 Energy Recovery Technology

The Monitair 110 doesn’t just remove moisture – it captures the latent energy contained in water vapor and converts it into 6.4 kW of usable heat. This “free heat” warms your pool hall naturally, reduces boiler demand, and significantly lowers your energy bills. Combined with the LPHW heating coil, you get a total of 12.2 kW heating capacity.

🔧 Through-Wall Installation

Mounting the unit outside your pool hall offers multiple advantages:

• Maximizes Interior Space – No floor or wall space lost to equipment
• Quieter Operation – Equipment noise stays outside
• Easier Maintenance – Service access without disrupting pool users
• Better Aesthetics – Decorative grilles are all that’s visible in the pool hall

🌡️ Integrated LPHW Air Heating

The built-in Low Pressure Hot Water heating coil provides 8.9 kW of additional heating capacity, eliminating the need for separate radiators or fan heaters. The system includes a motorized 3-way valve for precise temperature control and connects directly to your existing boiler system via 22mm copper connections.

❄️ Advanced Defrost System

Unlike basic dehumidifiers that fail in cold conditions, the Monitair 110 includes automatic defrost functionality, ensuring reliable operation even when ambient temperatures drop to 5°C. Perfect for UK winters and unheated plant rooms.

🔇 Whisper-Quiet Performance

At just 48.5 dB(A) measured at 3 meters, this unit operates quieter than normal conversation, ensuring your pool environment remains peaceful and relaxing.

🛡️ Building Protection

Uncontrolled humidity in pool halls causes:

• Structural Corrosion – Steel beams, fixings, and metal fittings deteriorate rapidly
• Mold Growth – Creates health hazards and unsightly staining
• Paint & Plaster Damage – Peeling, blistering, and degradation
• Window Condensation – Constant dripping and frame rot

The Monitair 110 prevents all of these issues by maintaining ideal humidity levels (typically 55-60% RH), protecting your building investment and creating a healthy, comfortable environment.

Room Size & Application Guide

Recommended Pool Hall Volumes

The DH110AX/TL is designed for medium to large indoor pool installations. Use the table below to determine suitability for your application:

Pool Size	Water Surface Area	Typical Pool Hall Volume	Suitability
Small Domestic	Up to 25 m²	Up to 200 m³	✅ Excellent
Medium Domestic	25-40 m²	200-350 m³	✅ Excellent
Large Domestic	40-60 m²	350-500 m³	✅ Excellent
Small Commercial	60-80 m²	500-650 m³	✅ Suitable*
Medium Commercial	80-100 m²	650-800 m³	⚠️ Consult**

*For commercial applications with higher bather loads, consider additional ventilation **For larger spaces, multiple units or ducted systems may be required

Ideal Applications

✅ Domestic Swimming Pools – Private homes, granny flats, converted barns ✅ Therapy & Rehabilitation Pools – Physiotherapy centers, hydrotherapy facilities ✅ Hotel & Spa Facilities – Boutique hotels, B&Bs, small leisure centers ✅ Health Club Pools – Private gyms, small fitness facilities ✅ Holiday Let Properties – Luxury cottages, holiday homes with pools

Dehumidification Performance Estimates

How Long to Control Humidity?

The time required to bring a saturated pool hall to ideal conditions depends on starting humidity, air volume, and temperature. Here are typical scenarios:

Pool Hall Volume	Starting RH	Target RH	Estimated Time*
200 m³	75%	60%	3-4 hours
300 m³	75%	60%	5-6 hours
400 m³	75%	60%	6-8 hours
500 m³	75%	60%	8-10 hours
200 m³	85%	60%	5-6 hours
300 m³	85%	60%	7-9 hours
400 m³	85%	60%	9-12 hours

*Estimates assume 28°C pool hall temperature, active pool surface (no cover), and normal evaporation rates

⚠️ Important Disclaimers:

• These are theoretical estimates based on standard conditions
• Actual performance varies with pool water temperature, air temperature, bather load, and ventilation
• Using a pool cover when not in use dramatically reduces dehumidification demand
• Initial startup after construction or refurbishment may take longer due to building fabric moisture

Running Cost Comparison

Energy Efficiency Benefits

The Monitair 110’s energy recovery system delivers significant cost savings compared to traditional ventilation-only humidity control:

System Type	Daily Energy Cost*	Annual Cost*	CO₂ Emissions**
Monitair 110 (Heat Recovery)	£5.08	£1,854	1,850 kg/year
Ventilation Only (No Recovery)*	£12.50	£4,563	4,560 kg/year
Annual Saving with Monitair	£7.42/day	£2,709/year	2,710 kg less

*Based on 24/7 operation at 2.12 kW nominal consumption plus heating offset value. Electricity at £0.10/kWh **Based on UK grid average 0.233 kg CO₂ per kWh ***Ventilation-only systems require heating all incoming fresh air with no energy recovery

💰 What You Save

Year 1: £2,709 in energy costs Year 5: £13,545 in cumulative savings Year 10: £27,090 in cumulative savings

Plus additional savings from reduced boiler usage due to the 6.4 kW heat recovery!

Installation Requirements

Through-Wall Installation Checklist

Wall Preparation

✅ Wall Thickness: Suitable for standard 280-350mm cavity walls ✅ Opening Dimensions:

• Supply opening: 988mm (W) x 342mm (H)
• Intake opening: 888mm (W) x 260mm (H) ✅ Structural Support: Lintel required for openings; consult structural engineer ✅ Cavity Sealing: All cavities around ducts must be sealed to prevent air recirculation ✅ Waterproofing: External wall penetrations must be properly sealed and flashed

Electrical Requirements

✅ Supply: 230V, 50Hz, single-phase ✅ Fuse: 20 Amp motor-rated fuse ✅ Cable: Minimum 4mm² twin + earth cable recommended ✅ Protection: Dedicated circuit with RCD protection ✅ Controls: Separate humidistat and air thermostat required (available separately)

LPHW Plumbing Requirements

✅ Connections: 22mm copper stub connections (flow and return) ✅ Boiler Capacity: Minimum 9.6 kW available for air heating ✅ Flow Rate: 9.6 litres/min at 80°C supply temperature ✅ Valve: Motorized 3-way valve included in unit ✅ Pipework: Insulated flow and return pipes to minimize heat loss

Condensate Drainage

✅ Drain Connection: 15mm stub connection ✅ Fall Required: Minimum 1:40 fall to drain point ✅ Trap: U-trap required to prevent air backflow ✅ Capacity: System generates up to 4.5 litres/hour condensate

Clearances & Access

✅ Plant Room Space: Minimum 600mm clearance on all sides for maintenance ✅ Service Access: Adequate room for filter access and component servicing ✅ Floor Level: Unit must be installed level; adjustable feet provided

Professional Installation Recommended

⚠️ This is a professional-grade climate control system requiring qualified installation by:

• Gas Safe registered engineers (for LPHW connections)
• Part P qualified electricians (for electrical work)
• Experienced pool technicians (for system commissioning)

Frequently Asked Questions

1. What size pool hall can the Monitair 110 handle?

The DH110AX/TL is suitable for pool halls up to approximately 500-600 m³ with water surface areas up to 60 m² in domestic settings. For commercial applications with higher bather loads and ventilation requirements, consult with a pool environmental specialist to ensure adequate capacity.

2. Can I install this unit myself?

We strongly recommend professional installation. The unit requires:

• Structural work (wall penetrations and support)
• Single-phase electrical connection by a Part P qualified electrician
• LPHW plumbing by a Gas Safe registered engineer (if using heating option)
• Proper commissioning to ensure optimal performance

DIY installation may void warranty and create safety hazards.

3. How much does it cost to run?

At nominal 2.12 kW power consumption running 24/7, electricity costs are approximately £5.08/day (at £0.10/kWh). However, the 6.4 kW heat recovery significantly offsets heating costs. Total operating costs are typically 50-60% lower than ventilation-only systems when you factor in the free heat recovered and LPHW heating efficiency.

4. Does the LPHW heating eliminate the need for radiators?

In most cases, yes. The combined 12.2 kW total heating capacity (6.4 kW heat recovery + 8.9 kW LPHW) is sufficient for typical domestic pool halls with proper insulation. However, very large spaces, poorly insulated buildings, or extreme climates may benefit from supplementary heating.

5. How loud is the unit inside the pool hall?

Very quiet! The through-wall configuration places the compressor and main equipment outside the pool hall. Inside, you’ll only hear the gentle airflow through the decorative grilles. Measured noise is 48.5 dB(A) at 3 meters – quieter than a normal conversation.

6. What maintenance is required?

Monthly:

• Check and clean washable air filters (accessed from pool hall side)
• Inspect condensate drainage for blockages

Annually:

• Professional service including refrigerant pressure check, electrical connections inspection, and coil cleaning
• LPHW system inspection and water treatment check

Every 2-3 Years:

• Deep clean of heat exchanger coils
• Replacement of worn components as needed

All maintenance can be performed from outside the pool hall thanks to the through-wall design.

7. Will this work with my existing boiler?

The unit requires a minimum of 9.6 kW available boiler capacity and operates on standard 80°C LPHW (low pressure hot water). Most modern domestic boilers provide 24-30+ kW, so compatibility is rarely an issue. The unit includes a motorized 3-way valve to control heat input automatically based on demand.

8. How does the defrost system work?

When the unit detects ice formation on the evaporator coil (typically when ambient temperatures drop below 5°C), it automatically initiates a defrost cycle. The system briefly reverses the refrigeration cycle to melt ice, then resumes normal dehumidification. This happens automatically without user intervention.

9. Can I use this in a conservatory or single-skin building?

While technically possible, we don’t recommend it for permanent year-round use. Single-skin enclosures have poor insulation values and high heat loss, requiring significantly more heating capacity. The unit will struggle to maintain comfortable conditions in winter. Consider upgrading to double or triple glazing, or adding thermal insulation first.

10. What’s the warranty coverage?

The Monitair 110 is covered by Certikin’s comprehensive 2-year parts and labor warranty from the date of installation. Warranty requires professional installation and annual servicing by qualified technicians. Extended warranty options may be available – contact your supplier for details.

11. How long will it take to deliver and install?

Delivery: Typically 5-10 working days from order (subject to stock availability) Installation: 2-3 days including:

• Day 1: Wall penetration, structural work, and rough-in
• Day 2: Unit installation, electrical and LPHW connections
• Day 3: Commissioning, testing, and handover

Total project time is usually 1-2 weeks from order to operational status.

12. Is R407C refrigerant being phased out?

R407C is an HFC refrigerant that will eventually be replaced under F-Gas regulations, but it remains widely available and fully supported. The refrigerant can be topped up or replaced throughout the unit’s service life. Future-proof design ensures the unit can be retrofitted with alternative refrigerants if needed.

What’s Included

Standard Package Contents

📦 Main Unit – DH110AX/TL through-wall dehumidifier with LPHW heating 📦 Wall Mounting Brackets – Heavy-duty brackets for secure installation 📦 Decorative Grilles – White powder-coated supply and intake grilles for pool hall side 📦 Air Filters – Washable filters (pre-installed) 📦 Condensate Drain Stub – 15mm connection 📦 LPHW Connection Stubs – 22mm copper flow and return (pre-fitted) 📦 Installation Manual – Complete setup and commissioning guide 📦 User Guide – Operation and maintenance instructions

Required But Not Included

⚠️ Humidistat Controller – Adjustable 20-80% RH range (sold separately)

⚠️ Air Thermostat – Required for LPHW heating control (sold separately)

⚠️ Electrical Cabling – From distribution board to unit

⚠️ LPHW Pipework – Insulated flow and return pipes from boiler

⚠️ Condensate Drain Pipework – From unit to drain point

⚠️ Wall Sleeves/Sealing Materials – For cavity wall installations

Why Buy From Parts4Tubs?

✅ Authorized Certikin Dealer – Genuine products with full manufacturer warranty

✅ Expert Advice – Decades of pool equipment experience

✅ Technical Support – Pre and post-sale assistance

✅ Competitive Pricing – Best value for professional-grade equipment

✅ Fast Dispatch – Quick delivery across the UK

📄 Downloads & Documentation

Access comprehensive technical resources to support installation, specification, and operation:

📄 Product Data Sheet – Monitair 110 Specifications (opens in new tab) Complete technical specifications, dimensions, electrical data, and installation diagrams for the Monitair 110 through-wall model. Essential for installers and specifiers.

📄 Vaporex and Monitair Product Brochure 2022 (opens in new tab) Comprehensive brochure covering the complete Calorex dehumidifier range including model comparisons, applications, and performance data. Includes information on wall mount and through-wall options.

📄 Guidelines to Pool Hall Construction 2022 (opens in new tab) Essential reading for anyone planning an indoor pool project. Covers structural considerations, insulation requirements, vapor barriers, glazing, drainage, and material selection to prevent moisture damage and ensure optimal dehumidification performance.

💡 Installation Support: Need help with specification or installation planning? Contact our technical team for expert guidance.

Environmental Responsibility

Sustainable Pool Management

The Monitair 110 exemplifies modern sustainable building practices:

🌱 Energy Recovery – Captures 6.4 kW of “free” heat from moisture, reducing fossil fuel consumption 🌱 R407C Refrigerant – Ozone-friendly refrigerant with zero ODP (Ozone Depletion Potential) 🌱 Reduced Carbon Footprint – Up to 2,710 kg less CO₂ annually vs. ventilation-only systems 🌱 Building Longevity – Prevents moisture damage, extending structural lifespan and reducing material waste 🌱 Efficient Operation – Variable humidity control prevents over-dehumidification and wasted energy

Contributing to Building Regulations Compliance

The Monitair 110 helps meet current UK Building Regulations requirements for:

• Part F (Ventilation) – Effective moisture control and air quality management
• Part L (Conservation of Fuel and Power) – Energy-efficient climate control with heat recovery
• Part C (Resistance to Contaminants and Moisture) – Protection against condensation and mold growth

Ready to Transform Your Pool Environment?

The DH110AX/TL Monitair 110 represents a serious investment in the comfort, health, and longevity of your indoor pool facility. With professional-grade performance, energy-efficient operation, and comprehensive climate control, it’s the smart choice for discerning pool owners and facility managers.

Next Steps

1. Review Technical Documents – Download the PDFs above to verify compatibility with your project
2. Consult a Professional – Contact a qualified pool environmental engineer for site assessment
3. Request a Quote – Add to cart or contact us for competitive pricing
4. Schedule Installation – Book your installation with certified professionals

Questions? Our technical team is here to help. Contact us for expert advice on whether the Monitair 110 is the right solution for your indoor pool.