🌊 Dantherm DH65 Defrost Swimming Pool Dehumidifier with 4kW Electric Heating

Professional-Grade Moisture Control for Indoor Pool Environments

The Dantherm DH65AX/E is a powerful wall-mounted dehumidifier engineered specifically for indoor swimming pools, therapy pools, health clubs, and spa facilities. Combining efficient moisture extraction with integrated 4kW electric heating, this unit not only controls humidity but actively warms your pool room—creating a comfortable, dry environment while protecting your building from moisture damage.

Indoor swimming pools generate enormous amounts of moisture through evaporation. Without proper humidity control, this leads to condensation, mould growth, structural corrosion, and an uncomfortable environment. The DH65 solves these problems by removing up to 50 litres of moisture per day while simultaneously recovering heat energy and adding supplementary electric heating—keeping your pool room warm, dry, and inviting.

Unlike cheaper residential dehumidifiers that fail in pool environments, the Dantherm DH65 features fully anti-corrosion coated coils, aluminium housing with corrosion-resistant coating, and is specifically designed to withstand the harsh, chlorinated atmosphere of indoor pools.

⭐ Key Benefits at a Glance

✅ Removes 50 Litres Daily – Powerful moisture extraction keeps pool rooms dry and comfortable
✅ 4kW Integrated Electric Heating – Supplementary warmth with accessible pre-installed thermostat
✅ Heat Recovery Technology – Recovers 3.3kW of free heat from moisture extraction
✅ Total Heat Output: 6.9kW – Combined heat recovery + electric heating
✅ Corrosion-Resistant Design – Aluminium housing and anti-corrosion coated coils for pool environments
✅ Defrost Function – Operates down to 5°C for year-round performance
✅ Electronic Humidistat – Precise humidity control (40-80% RH)
✅ Two Fan Modes – Cycle and Continuous operation for flexible control
✅ Compact Wall-Mount Design – Saves floor space (1306mm W × 720mm H × 265mm D)
✅ R454C Refrigerant – Modern, environmentally responsible refrigerant

💡 Ideal Applications

Perfect for:

• 🏊 Domestic indoor swimming pools
• 🧘 Therapy and rehabilitation pools
• 💪 Health club and gym pools
• 🏨 Hotel and spa swimming facilities
• 🏠 Residential pool rooms up to 70m² floor area
• 🏢 Commercial pool installations requiring wall-mounted solutions

📐 Room Coverage & Performance Guide

Recommended Room Sizes

Pool Room Floor Area	Pool Size (Approximate)	DH65 Suitability
Up to 40m²	4m × 8m (32m²) pool	✅ Ideal
40-70m²	5m × 10m (50m²) pool	✅ Recommended
70-90m²	6m × 12m (72m²) pool	⚠ Consider DH75 or DH110 for larger pools

Note: Actual performance depends on pool water temperature, air temperature, ventilation, insulation, and usage patterns.

Moisture Extraction Performance

Daily Capacity: 50 litres per 24 hours
Hourly Capacity: 2.0 litres per hour

Typical Dehumidification Times (Estimates):

Pool Room Volume	Initial RH	Target RH	Estimated Time to Target*
200m³ (50m² × 4m height)	75%	60%	8-12 hours
250m³ (62m² × 4m height)	75%	60%	10-15 hours
300m³ (75m² × 4m height)	75%	60%	12-18 hours

⚠ These are estimates based on standard conditions (30°C air, 60% RH, 28°C pool water). Actual times vary with temperature, ventilation, insulation, and pool usage.

📋 Complete Technical Specifications

Dehumidification Performance

Specification	Value
Dehumidification Capacity	2.0 L/hour (50 L/day)
Operating Conditions	Air: 30°C at 60% RH, Pool water: 28°C
Defrost Function	Standard (operates down to 5°C)
Humidistat Range	40-80% RH (electronically controlled)
Refrigerant Type	R454C (modern eco-friendly refrigerant)

Heating Performance

Specification	Value
Heat Recovery (from dehumidification)	3.3 kW
Electric Heat Output	4.0 kW (3.5 kW heating element)
Total Combined Heat Output	6.9 kW
Heating Control	Pre-installed accessible thermostat

Airflow & Ventilation

Specification	Value
Air Flow Rate	800 m³/hour
Fan Operating Modes	Cycle and Continuous
Noise Level	47 dB(A) at 3 metres

Electrical Requirements

Specification	Value
Power Supply	230V / 50Hz (single phase)
Fuse Rating	30 Amp (motor rated fuse required)
Nominal Running Current	20.1 Amps
Full Load Amps (FLA)	21.0 Amps
Power Consumption (Nominal)	4.58 kW
Compressor LRA	21.6 Amps

Physical Dimensions & Installation

Specification	Value
Unit Type	Wall-mounted
Width (unpacked)	1306 mm
Height (unpacked)	720 mm
Depth (unpacked)	265 mm
Condensate Drain Connection	16 mm
Construction	Aluminium housing with corrosion-resistant coating
Coil Protection	Fully anti-corrosion coated coils

🔧 Outstanding Features in Detail

1. Powerful 4kW Integrated Electric Heating

The factory-fitted electric heating element provides 4kW of supplementary heat to your pool room, eliminating the need for separate radiators or fan heaters. The easily accessible pre-installed thermostat allows precise temperature control, ensuring your pool environment remains comfortable even during cold weather.

Combined with the 3.3kW of free heat recovered from dehumidification, the DH65 delivers a total of 6.9kW of heating power—enough to maintain comfortable temperatures in pool rooms up to 70m².

2. Corrosion-Resistant Construction for Pool Environments

Indoor pool environments are highly corrosive due to chlorine, moisture, and chemicals. The DH65 is purpose-built to withstand these conditions:

• Aluminium housing with specialized corrosion-resistant coating
• Fully anti-corrosion coated evaporator and condenser coils
• Designed for decades of reliable operation in pool halls

Cheaper dehumidifiers rust and fail within months in pool environments. The DH65 is engineered for longevity.

3. Heat Recovery Technology = Lower Running Costs

The DH65 doesn’t just remove moisture—it cleverly converts the energy locked in that moisture into useful heat (3.3kW). This “free” heat recovery means:

💰 Reduced boiler usage – Less fossil fuel consumption
💰 Lower heating bills – Free heat from dehumidification
💰 Faster drying – Warm air accelerates moisture removal
💰 Reduced pool evaporation – Warm, dry air means less water loss
🌱 Environmentally friendly – Waste heat is recycled, not wasted

4. Electronic Humidistat for Precision Control

The built-in electronic humidistat allows you to set your desired humidity level anywhere between 40% and 80% RH. The unit automatically maintains this setpoint, switching on when humidity rises and off when the target is reached.

Recommended Settings:

• Swimming pools: 50-60% RH
• Therapy pools: 55-65% RH
• Spa facilities: 50-60% RH

5. Defrost Function for Year-Round Operation

The standard defrost function allows the DH65 to operate efficiently even in colder conditions down to 5°C. This ensures consistent performance throughout winter months when pool rooms may experience lower temperatures.

6. Dual Fan Operating Modes

Cycle Mode: The fan runs intermittently based on humidity levels (quieter, energy-efficient)
Continuous Mode: The fan runs constantly for maximum air circulation and faster drying

Switch between modes depending on your pool room’s needs.

7. Compact Wall-Mount Design

At just 265mm deep, the DH65 mounts flush to the wall, saving valuable floor space in your pool room. The slim profile keeps the unit unobtrusive while maintaining full performance.

📥 Downloads & Documentation

📄 Technical Brochure & Full Specifications

Download Dantherm Pool Dehumidifier Range Brochure (PDF) (opens in new tab)

What’s Inside This Document: This comprehensive 8-page brochure covers the complete Dantherm non-ducted swimming pool dehumidifier range, including detailed technical specifications, installation guidelines, and performance data for all models (DH35, DH65, DH75, DH110, DH120). Includes dimensional drawings, electrical requirements, heating capacities, and application guidance for domestic and commercial pool installations.

💰 Running Costs & Energy Efficiency

Estimated Annual Operating Costs

Based on typical pool room operation (8 hours per day at full load):

Operating Mode	Power Draw	Daily Cost (£)*	Annual Cost (£)*
Dehumidification Only	1.08 kW	£0.29	£106
Dehumidification + Electric Heating	4.58 kW	£1.24	£453

Based on electricity cost of £0.27/kWh (UK average 2024). Actual costs vary with usage patterns and energy tariffs.

Energy Efficiency Benefits

✅ Heat Recovery: The 3.3kW of free heat recovered from moisture extraction significantly reduces heating costs compared to running separate electric heaters.

✅ Lower Boiler Usage: By providing supplementary heating, the DH65 keeps your boiler off for longer periods, reducing gas consumption.

✅ Reduced Pool Evaporation: A warm, dry environment reduces water evaporation from the pool surface by up to 30%, saving on water heating costs and chemical usage.

✅ R454C Refrigerant: Modern low-GWP (Global Warming Potential) refrigerant is more environmentally responsible than older R410A or R22 systems.

🏊 Why Proper Humidity Control Matters for Pool Rooms

The Hidden Dangers of Excess Moisture

Indoor swimming pools constantly release moisture into the air through evaporation. A typical domestic pool can evaporate 20-50 litres of water per day depending on size, temperature, and usage. Without proper dehumidification, this moisture causes:

⚠ Structural Damage: Condensation on cold surfaces leads to wood rot, plaster damage, and metal corrosion
⚠ Mould & Mildew: Fungal growth on walls, ceilings, and soft furnishings creates health risks
⚠ Respiratory Issues: High humidity and mould spores trigger asthma and allergies
⚠ Uncomfortable Environment: Muggy, clammy air is unpleasant for swimmers
⚠ Glass Condensation: Windows fog up, obscuring views and causing water damage
⚠ Higher Heating Costs: Humid air feels colder, forcing you to overheat the space

The Dantherm Solution

The DH65 maintains your pool room at the ideal humidity level (typically 50-60% RH), preventing all these problems while simultaneously providing supplementary heating. Your pool room stays:

✅ Comfortable and inviting – Warm and dry, not muggy
✅ Structurally protected – No condensation damage
✅ Mould-free – Humidity too low for fungal growth
✅ Energy efficient – Less heating required due to lower humidity
✅ Safe and healthy – No respiratory irritants from mould

🔍 What Makes the Dantherm DH65 Different?

Dantherm DH65 vs. Residential Dehumidifiers

Feature	Dantherm DH65	Typical Residential Units
Pool Environment Durability	✅ Fully corrosion-resistant	❌ Corrode rapidly in pool environments
Daily Capacity	50 litres	10-25 litres
Heat Recovery	✅ 3.3 kW free heat	❌ No heat recovery
Integrated Heating	✅ 4 kW electric heating	❌ No heating function
Defrost Function	✅ Operates to 5°C	Limited or none
Warranty	2 years manufacturer warranty	1 year typical
Design Life	15+ years in pool environments	1-3 years in pool environments

Bottom Line: Residential dehumidifiers are not designed for pool environments and will fail quickly due to corrosion and inadequate capacity. The Dantherm DH65 is a professional pool dehumidifier built to last.

❓ Frequently Asked Questions

1. What size pool room is the DH65 suitable for?

The DH65 is ideal for pool rooms with a floor area of 40-70m² and pool surface areas up to approximately 50m² (e.g., 5m × 10m pool). For larger installations, consider the DH75, DH110, or DH120 models. Room height, insulation, ventilation, and usage patterns also affect suitability—consult with a pool specialist for precise sizing.

2. Can I use the electric heating without the dehumidification?

No, the unit is designed as an integrated system. The electric heating provides supplementary warmth on top of the heat recovered from dehumidification. However, you can operate the dehumidifier without the electric heating switched on via the thermostat control.

3. How loud is the DH65 during operation?

The DH65 produces 47 dB(A) at 3 metres, comparable to a quiet conversation or background music. It’s quieter than many household appliances and is designed to operate unobtrusively in pool environments. The Cycle fan mode is quieter than Continuous mode.

4. What maintenance does the DH65 require?

Regular Maintenance:

• Clean or replace air filters every 3-6 months (more frequently with heavy use)
• Inspect condensate drain for blockages monthly
• Check coils annually for dust buildup (vacuum gently if needed)
• Annual professional service recommended for long-term reliability

Low Maintenance Design: The corrosion-resistant coils and robust construction minimize maintenance requirements compared to cheaper units.

5. Where does the collected water go?

The DH65 has a 16mm condensate drain connection that should be plumbed to a suitable drain or waste pipe. Condensate drains away continuously during operation—there’s no water tank to empty.

6. Will this unit heat my pool water?

No, the DH65 heats the air in your pool room, not the pool water itself. The warm, dry air it produces helps reduce heat loss from the pool surface by minimizing evaporation, but it does not directly heat the water. Pool water heating requires a separate pool heater or heat pump.

7. What electrical supply do I need?

The DH65 requires a 230V single-phase supply with a 30 Amp motor-rated fuse. The unit draws 20.1 Amps nominal running current and consumes 4.58 kW. Professional electrical installation by a qualified electrician is essential.

8. Can I install this myself?

Professional installation is strongly recommended. Installation involves:

• Electrical connection (requires qualified electrician)
• Wall mounting (unit weighs approximately 30-35kg)
• Condensate drainage plumbing
• Positioning for optimal airflow and access

Incorrect installation can void the warranty and lead to poor performance.

9. Does the DH65 work in cold conditions?

Yes, the standard defrost function allows operation down to 5°C. If your pool room temperature drops below this (rare for maintained pool rooms), the unit will temporarily shut down to prevent damage. The electric heating helps maintain comfortable temperatures even in winter.

10. What’s the difference between the DH65AX/E and DH65AX/L?

• DH65AX/E: Electric heating (4kW) – this model
• DH65AX/L: Low-pressure hot water (LPHW) heating (7.5kW) – requires connection to your boiler system

The electric heating model (AX/E) is simpler to install and doesn’t require boiler integration, making it ideal for retrofit installations or where boiler capacity is limited.

11. How long will the DH65 last?

With proper maintenance, the Dantherm DH65 is designed for a 15-20 year service life in pool environments. The corrosion-resistant construction and robust components ensure long-term reliability. A 2-year manufacturer’s warranty is included, and Dantherm is supported by a nationwide network of service engineers.

12. Will this unit eliminate all condensation on windows?

The DH65 will dramatically reduce condensation by maintaining optimal humidity levels (50-60% RH). However, condensation on single-glazed windows or poorly insulated surfaces may still occur during very cold weather when there’s a large temperature difference between inside and outside. Double-glazing or improved insulation eliminates this issue.

⚙ Installation Requirements & Guidelines

Electrical Installation

🔌 Power Supply: 230V single-phase, 50Hz
🔌 Fuse Protection: 30 Amp motor-rated fuse required
🔌 Cable Sizing: Minimum 6mm² cable (consult electrician for exact requirements based on cable run)
🔌 Isolation Switch: Must be installed for safe maintenance

⚠ Professional electrical installation by a qualified electrician is mandatory.

Wall Mounting Requirements

📏 Wall Strength: Must support minimum 50kg load (unit + mounting hardware)
📏 Mounting Height: Typically 2-2.5m from floor for optimal air circulation
📏 Clearances Required:

• Minimum 500mm clearance above unit for air intake
• Minimum 300mm clearance below unit for air discharge
• Minimum 200mm clearance either side for service access

Condensate Drainage

💧 Drain Connection: 16mm outlet (standard compression or push-fit fitting)
💧 Drainage Route: Gravity drain to waste pipe or floor drain
💧 Fall Required: Minimum 1:40 gradient for reliable drainage
💧 Trap Required: U-trap recommended to prevent odour backflow

Positioning & Airflow

🌬 Air Circulation: Position to ensure good air distribution across pool room
🌬 Avoid Obstacles: Keep air intake and discharge free from obstructions
🌬 Multiple Units: For large pool rooms, multiple units should be positioned to provide even coverage

✅ What’s Included with Your DH65

When you purchase the Dantherm DH65 + Defrost + 4kW Electric Heating, you receive:

✅ Dantherm DH65AX/E dehumidifier unit
✅ Factory-fitted 4kW electric heating element
✅ Pre-installed accessible thermostat for heating control
✅ Electronic humidistat (40-80% RH adjustable)
✅ Wall mounting brackets
✅ Installation and operation manual
✅ 2-year manufacturer’s warranty
✅ Nationwide service engineer support

Not Included (required for installation): ❌ Electrical wiring and connection (electrician required)
❌ Condensate drainage pipework
❌ Isolation switch

🌟 Make Your Pool Room Comfortable & Protected

The Dantherm DH65 + Defrost + 4kW Electric Heating is the professional solution for indoor pool humidity control. Purpose-built for the harsh pool environment with corrosion-resistant construction, powerful 50L/day moisture removal, integrated electric heating, and intelligent controls—it’s the smart choice for protecting your investment and ensuring year-round comfort.

Stop fighting condensation, mould, and cold, clammy air. Invest in professional-grade humidity control with the Dantherm DH65.

🛒 Ready to Transform Your Pool Room?

Order your Dantherm DH65 today and enjoy:

✅ Dry, comfortable pool environment
✅ Protection from structural damage
✅ Lower heating costs through heat recovery
✅ Professional-grade reliability
✅ 2-year manufacturer warranty