🌊 Dantherm DH65 Wall-Mounted Pool Dehumidifier with Defrost Function

Professional-grade moisture control for indoor swimming pools – The Dantherm DH65 is engineered to protect your pool building from moisture damage while creating a comfortable, healthy environment. With enhanced LPHW air heating capacity compared to legacy models and minimal installation modifications required, this dehumidifier offers superior performance in a compact, corrosion-resistant package.

Transform your indoor pool environment with advanced moisture management technology. The DH65 doesn’t just remove excess humidity – it recovers energy from moisture and converts it into usable heat, reducing your heating costs while protecting your building from structural damage, mould, and corrosion.

Perfect for: Domestic pools, therapy pools, health club facilities, hotel pools, spa environments, and commercial aquatic centres.

💡 Key Benefits at a Glance

🛡️ Building Protection – Prevents costly structural damage from moisture, mould growth, and corrosion
💰 Energy Recovery – Converts moisture energy into heat, reducing boiler usage and operating costs
🔧 Easy Retrofit – Larger heating capacity than original Vaporex with minimal pipework adjustments
⚡ Flexible Operation – Two fan modes (Cycle and Continuous) for optimal efficiency
❄️ All-Season Performance – Built-in defrost function allows operation down to 5°C
🎯 Precise Control – Electronic humidistat adjustable from 40% to 80% RH
🌡️ Optional Heating – Eliminates need for separate fan heaters or radiators

📋 Complete Technical Specifications

Dehumidification Performance

Specification	DH65AX (Standard)	DH65AX/L (with LPHW Heating)	DH65AX/E (with Electric Heating)
Dehumidification Capacity	2.0 L/hr (50 L/day)	2.0 L/hr (50 L/day)	2.0 L/hr (50 L/day)
Heat Recovery Output	3.3 kW	3.3 kW	3.3 kW
LPHW Air Heating	Not applicable	7.5 kW	Not applicable
Electric Heat Output	Not applicable	Not applicable	3.5 kW
Total Heat Output	3.3 kW	11.7 kW (LPHW + Recovery)	6.9 kW (Electric + Recovery)
Air Flow Rate	800 m³/hr	800 m³/hr	800 m³/hr

Electrical Requirements

Specification	DH65AX (Standard)	DH65AX/L (with LPHW)	DH65AX/E (with Electric)
Power Supply	230V / 50Hz	230V / 50Hz	230V / 50Hz
Fuse Rating	13 Amp	13 Amp	30 Amp
Nominal Running Current	4.9 Amp	4.9 Amp	20.1 Amp
Full Load Amps (FLA)	5.8 Amp	5.8 Amp	21.0 Amp
Power Consumption	1.08 kW	1.08 kW	4.58 kW
Compressor LRA	21.6 Amp	21.6 Amp	21.6 Amp

LPHW Heating Specifications (Model DH65AX/L Only)

Parameter	Value
LPHW Flow Rate	11.7 litres/min
LPHW Pressure Drop	1.8 metres head
Boiler Water Temperature	80°C (design condition)
Valve Control	Includes separate air stat for motorized valve

Physical Dimensions & Installation

Dimension	Measurement
Width (unpacked)	1,306 mm
Height (unpacked)	720 mm
Depth (unpacked)	265 mm
Condensate Drain	16 mm connection
Noise Level @ 3m	47 dB(A) – Whisper-quiet operation
Mounting Type	Wall-mounted with dual position LPHW pipework connections

Environmental & Operating Conditions

Parameter	Value
Refrigerant Type	R454C (environmentally responsible)
Operating Temperature Range	Down to 5°C (with defrost function)
Humidistat Range	40% to 80% RH (adjustable)
Design Conditions	30°C air temp, 60% RH, 28°C pool water
Warranty	2 years manufacturer’s warranty

🎯 Standout Features Explained

1. Enhanced LPHW Heating Capacity 🔥

The DH65AX/L model provides 7.5 kW of LPHW air heating – significantly larger than legacy Vaporex units while maintaining comparable physical size. This means you can upgrade your heating capacity without major structural changes to your pool room. The dual-position LPHW pipework connections offer installation flexibility, reducing labour time and costs.

2. Marine-Grade Corrosion Protection 🛡️

Swimming pool environments are extremely corrosive. The DH65 features an aluminium housing with fully anti-corrosion coated coils using advanced cataphoresis painting technology. This extends equipment lifespan dramatically compared to standard steel units, protecting your investment in the harsh chlorine-laden atmosphere of indoor pools.

3. Intelligent Two-Mode Operation ⚙️

Choose between Cycle Mode for energy-efficient operation during low-use periods, or Continuous Mode for maximum moisture removal during peak pool usage. The electronic humidistat automatically maintains your target humidity level, preventing over-drying while ensuring optimal comfort.

4. Defrost Function for Year-Round Operation ❄️

Unlike basic dehumidifiers that fail in cold conditions, the DH65 includes standard defrost capability allowing operation down to 5°C. This is essential for UK winters, shoulder seasons, or pools with reduced heating, ensuring consistent protection even when ambient temperatures drop.

5. Energy Recovery Technology 💰

The DH65 doesn’t waste the energy it extracts. It recovers latent heat from moisture and returns it to your pool hall, providing 3.3 kW of “free” heating from dehumidification alone. This keeps your boiler off longer, reduces evaporation rates, and significantly lowers operating costs.

6. Compact Wall-Mount Design 📐

At just 265 mm deep, the DH65 installs flush to walls without consuming valuable pool hall space. The slim profile and modern appearance blend seamlessly with pool architecture while delivering commercial-grade performance.

7. R454C Refrigerant 🌍

Uses environmentally responsible R454C refrigerant with low global warming potential, meeting current and future environmental regulations while maintaining excellent thermodynamic performance.

📄 Downloads & Technical Documentation

Complete Product Brochure & Installation Guide 📥
Download: Dantherm Swimming Pool Dehumidifier Range Brochure (PDF) (opens in new tab)

This comprehensive 8-page technical document includes:

• Detailed specifications for the entire Dantherm range (DH35, DH65, DH75, DH110, DH120)
• Installation dimensions and wall-mounting guidelines
• Through-the-wall (TTW) installation options and cutout dimensions
• LPHW and electrical connection requirements
• Performance data across various operating conditions
• Comparison tables for model selection
• Warranty information and service network details

Need help interpreting technical specifications? Contact our team for expert guidance on model selection and installation planning.

📊 Real-World Performance & Room Coverage

Recommended Pool Room Coverage

The DH65 is ideally suited for the following pool environments based on its 50 litres/day moisture removal capacity:

Pool Type	Water Surface Area	Room Volume	Usage Pattern
Domestic Pools	Up to 25 m²	Up to 250 m³	Typical residential use
Small Commercial	Up to 20 m²	Up to 200 m³	Light commercial (therapy pools)
Therapy/Exercise Pools	Up to 22 m²	Up to 220 m³	Regular daytime use
Hotel/B&B Pools	Up to 20 m²	Up to 200 m³	Guest use (varied occupancy)

These estimates assume standard pool water temperature (28-30°C), proper building insulation, and room air temperature maintained at 28-32°C.

Moisture Removal in Different Conditions

The DH65’s performance varies based on environmental factors:

Room Condition	Air Temperature	Relative Humidity	Estimated Removal Rate
Optimal	30°C	60% RH	50 L/day (2.0 L/hr)
High Humidity	28°C	70% RH	~55 L/day
Lower Temperature	24°C	60% RH	~40 L/day
Cold Operation	15°C	60% RH	~25 L/day (defrost active)

⚠️ Important Note: Actual performance depends on pool water temperature, air circulation, ventilation rates, bather load, and building construction. These figures are estimates based on standard test conditions.

Heat Output & Energy Savings

Heat Recovery Benefits:

The DH65 recovers 3.3 kW of thermal energy from moisture extraction – that’s equivalent to running a 3,300-watt electric heater continuously, but at no additional cost beyond the dehumidifier’s operation.

With LPHW Heating Option (Model DH65AX/L):

• Total heat output: 11.7 kW (3.3 kW recovery + 7.5 kW LPHW)
• Replaces 3-4 standard wall-mounted radiators
• Eliminates need for separate fan heaters
• Single integrated solution for dehumidification and heating

Annual Cost Comparison (Typical Domestic Pool):

Heating Method	Estimated Annual Cost*
No Dehumidifier (high ventilation heating)	£2,800 – £3,500
Basic Dehumidifier (heat recovery only)	£1,800 – £2,200
DH65 with LPHW (integrated heating)	£1,400 – £1,800

Savings estimates based on typical domestic pool (6m x 3m), 8 months operation, current UK energy prices. Actual costs vary based on usage patterns, insulation, pool cover use, and regional energy rates.

🔧 Installation Considerations

Mounting Requirements

✅ Wall Mounting: Requires solid wall capable of supporting 40+ kg
✅ Clearances: Maintain 300mm above unit, 200mm sides, 400mm below for servicing
✅ Drainage: 16mm condensate connection required (gravity drain or condensate pump)
✅ Electrical: Dedicated circuit required (13A standard models, 30A electric heat model)
✅ Ventilation: Fresh air inlet recommended for optimal efficiency

LPHW Connection (Model DH65AX/L)

The heating variant requires connection to your existing LPHW (low pressure hot water) system:

• Flow rate: 11.7 litres/min
• Pressure drop: 1.8 metres head
• Design temperature: 80°C boiler water
• Includes separate air thermostat for motorized valve control
• Dual position pipework connections simplify installation

Note: Motorized valve and transformer supplied by installer – not included with unit.

Comparison with Alternative Solutions

Why Choose Integrated Dehumidification Over Traditional Ventilation?

Feature	DH65 Dehumidifier	Traditional Ventilation
Energy Efficiency	Recovers heat from moisture	Exhausts heated air (energy loss)
Operating Cost	Low – heat recovery reduces heating demand	High – must reheat incoming cold air
Humidity Control	Precise (adjustable 40-80% RH)	Difficult to control accurately
Winter Performance	Excellent – defrost function down to 5°C	Poor – very high heating demand
Noise Level	Quiet – 47 dB(A)	Moderate to loud (fans + ductwork)
Space Required	Compact wall unit	Extensive ductwork required
Maintenance	Filter cleaning, annual service	Ductwork cleaning, multiple fans

❓ Frequently Asked Questions

What size pool room can the DH65 handle?

The DH65 is designed for pool rooms with water surface areas up to 20-25 m² and room volumes up to 250 m³. This typically covers domestic pools up to 6m x 4m, or smaller commercial therapy pools. For optimal performance, ensure your room has reasonable insulation and uses a pool cover when not in use to reduce evaporation rates.

How much does the DH65 cost to run?

Operating costs depend on usage patterns and local energy rates. The standard DH65AX consumes 1.08 kW during operation. At current UK rates (~£0.27/kWh), continuous 24-hour operation would cost approximately £7.00 per day. However, with the electronic humidistat cycling the unit on/off, typical residential usage averages 8-12 hours daily, resulting in running costs of £2.30-£3.50 per day or approximately £70-£105 monthly during the swimming season.

The heat recovery feature offsets these costs by reducing your boiler usage, often resulting in net energy savings of 30-50% compared to traditional ventilation-based dehumidification.

Do I need the LPHW heating version or electric heating?

Choose LPHW (Model DH65AX/L) if:

• You have an existing LPHW heating system (boiler-based)
• You want maximum heat output (11.7 kW total)
• You’re replacing older pool room radiators or fan heaters
• You want the most energy-efficient heating solution

Choose Electric Heating (Model DH65AX/E) if:

• You don’t have LPHW/central heating in the pool room
• You want simpler installation (no pipework)
• You need supplementary heating (6.9 kW total)
• Initial installation cost is a priority

Choose Standard (Model DH65AX) if:

• You have adequate separate heating
• You want the lowest purchase and running costs
• The 3.3 kW heat recovery alone meets your needs

Can the DH65 operate in winter when my pool room is cooler?

Yes! The DH65 includes standard defrost functionality allowing operation down to 5°C. This is essential for UK climates where pool rooms may cool during winter months or when heating is reduced to save costs. The defrost system prevents ice buildup on the coils, maintaining dehumidification performance even in cold conditions.

However, performance does decrease at lower temperatures (approximately 50% capacity at 15°C compared to 30°C). For unheated pool rooms in winter, consider using a pool cover to reduce evaporation and maintain slightly higher room temperatures.

How noisy is the DH65 during operation?

The DH65 operates at just 47 dB(A) at 3 metres – comparable to quiet conversation or a library environment. This makes it suitable for domestic pools where noise levels matter, and perfectly acceptable for commercial therapy or hotel pools.

The two fan modes allow further control:

• Cycle Mode: Quieter, intermittent operation for low-use periods
• Continuous Mode: Slightly higher noise during peak usage for maximum moisture removal

What maintenance does the DH65 require?

Regular Maintenance (Owner):

• Monthly: Check and clean air filters (if accessible)
• Monthly: Inspect condensate drain for blockages
• Quarterly: Wipe down housing to remove dust/chlorine residue
• Before/after season: Check humidistat settings

Annual Professional Servicing:

• Refrigerant system inspection and pressure check
• Coil inspection and cleaning
• Electrical connections check
• Compressor performance assessment
• Defrost system verification

Dantherm dehumidifiers are supported by a nationwide network of service engineers, and the unit comes with a 2-year manufacturer’s warranty. Regular professional servicing extends equipment life significantly in corrosive pool environments.

How does the humidistat work?

The electronic humidistat is adjustable from 40% to 80% RH (relative humidity) via a simple dial or digital control. You set your desired humidity level – typically 55-65% RH for swimming pools – and the unit automatically cycles on and off to maintain that target.

Recommended Settings:

• 60-65% RH: Standard comfort level for most pools
• 55-60% RH: Therapy pools, commercial facilities (better mould prevention)
• 65-70% RH: Occasional use pools (reduces running costs)

Lower humidity settings increase comfort and reduce condensation but consume more energy. Higher settings save energy but may allow slight condensation in cold spots.

Will the DH65 eliminate condensation on my windows?

The DH65 significantly reduces condensation by controlling overall humidity levels, but it may not completely eliminate condensation on cold surfaces like single-glazed windows or poorly insulated walls. Condensation occurs when warm, humid air contacts cold surfaces below the dew point temperature.

For best results:

• Install double or triple glazing in the pool room
• Ensure walls have adequate insulation
• Maintain pool water temperature at 28-30°C (not higher)
• Use a pool cover when the pool is not in use
• Set the humidistat to 55-60% RH for optimal control
• Position the DH65 to circulate air across windows

If condensation persists on windows despite proper dehumidifier operation, this indicates an insulation issue rather than insufficient dehumidification capacity.

Can I install the DH65 myself?

Electrical work must be performed by a qualified electrician to comply with UK Building Regulations. The unit requires a dedicated circuit with appropriate fuse protection (13A for standard/LPHW models, 30A for electric heating model).

Mechanical installation (wall mounting, condensate drainage, LPHW connections) can be performed by competent DIY enthusiasts with appropriate tools and skills, but we strongly recommend professional installation for:

• LPHW models (plumbing connections, motorized valve installation)
• Ensuring correct drainage (slope, trap installation)
• Optimal positioning for air circulation
• Compliance with manufacturer’s warranty requirements

Many installers will also commission the unit properly, setting humidistat levels, checking refrigerant pressures, and ensuring optimal performance from day one.

Is the R454C refrigerant environmentally friendly?

Yes. R454C is a next-generation refrigerant with significantly lower Global Warming Potential (GWP) compared to older refrigerants like R410A and R407C. It meets current F-Gas regulations and is designed for long-term compliance with evolving environmental legislation.

R454C is also non-ozone depleting and offers excellent thermodynamic properties, meaning the DH65 maintains high efficiency while minimizing environmental impact. This refrigerant choice future-proofs your investment as environmental regulations continue to tighten.

What’s the difference between the DH65 and other models in the Dantherm range?

DH35: Smaller capacity (30 L/day), narrower width (885mm), lower heat output – suitable for smaller pools up to 15 m² surface area

DH65: Mid-range capacity (50 L/day), moderate size (1306mm width), 7.5 kW LPHW heating option – best for typical domestic pools 20-25 m²

DH75/DH110: Larger capacity (86-108 L/day), floor-standing or through-wall options, up to 8.9 kW LPHW heating – commercial pools and larger facilities

DH120: Highest capacity (94 L/day), floor-standing only, 15.9 kW LPHW option – large commercial pools, health clubs, hotels

The DH65 represents the sweet spot for most domestic and small commercial pools, offering excellent capacity without oversizing.

Does the unit come with a warranty?

Yes, the Dantherm DH65 includes a 2-year manufacturer’s warranty covering defects in materials and workmanship. The warranty is supported by a nationwide network of authorized service engineers, ensuring prompt support if issues arise.

Warranty conditions typically require:

• Professional installation by qualified personnel
• Registration of the unit with Dantherm/Certikin
• Annual professional servicing
• Operation within specified parameters (voltage, humidity, temperature)
• Use of appropriate water quality (chlorine levels, pH balance)

Always retain proof of purchase and installation records to support warranty claims.

Can I control the DH65 remotely or integrate it with home automation?

The standard DH65 features manual electronic humidistat control only – there is no built-in WiFi or smart home integration. However, the unit can be integrated into building management systems or home automation through:

For LPHW Models:

• The separate air thermostat output can interface with building management systems
• The motorized valve connection allows external control signals

For All Models:

• External relay switches can be fitted by installers to allow on/off control
• Third-party HVAC controllers can be integrated via electrical contractors

If remote monitoring is essential (especially for commercial installations), discuss integration options with your installer during the planning phase.

🏆 Why Buy from Parts4Tubs?

✅ Authorized Dantherm/Certikin Dealer – Genuine products, full manufacturer warranty
✅ Expert Technical Support – Experienced team to help with product selection
✅ Competitive Pricing – Best value on professional pool equipment
✅ Fast UK Delivery – Stock available for prompt dispatch
✅ Nationwide Service Network – Professional installation and servicing support available

🛒 Ready to Transform Your Pool Environment?

The Dantherm DH65 offers the perfect balance of capacity, efficiency, and value for domestic and small commercial swimming pools. Whether you’re building a new pool or upgrading from inadequate ventilation systems, this dehumidifier protects your investment while creating a comfortable, healthy environment.

Need help choosing the right model? Contact our technical team for expert guidance on selecting between standard, LPHW, and electric heating options based on your specific pool room requirements.

⚠️ Important Operating Notes:

• Performance figures based on air at 30°C and 60% RH, pool water at 28°C, boiler water at 80°C
• Actual dehumidification capacity varies with ambient conditions
• Fuses must be motor-rated for proper compressor protection
• Units with LPHW air heating include 1x separate air stat (motorized valve and transformer not included)
• Professional installation recommended to ensure warranty compliance and optimal performance
• Regular maintenance essential in corrosive swimming pool environments

Specifications subject to change without notice. Always verify current specifications with manufacturer documentation.