Heating & Floor Heating Buying Guide: Heating Methods & Thermal Efficiency Comparison
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In the south, installing radiators; in the north, switching to floor heating — which heating method should you choose? What are the pros and cons of water floor heating, electric floor heating, and radiators? How much do running costs differ? This guide breaks it down for you from a thermodynamic perspective.
1. Classification of Heating Methods
By Heat Transfer Medium
- Hydronic Heating: Hot water circulation (heated by boiler/wall-hung boiler)
- Electric Heating: Direct conversion of electricity to heat
- Air Source Heat Pump: Electrically driven heat pump that moves heat
By Heat Dissipation Method
- Radiant Heating: Floor heating (low-temperature radiation)
- Convection Heating: Radiators (high-temperature convection)
- Mixed Heating: Fan coil units
2. Comparison of Three Mainstream Heating Methods
1. Water Floor Heating
How It Works
- Wall-hung boiler heats water (35-45°C) → Water pipes buried in the floor → Floor radiates heat upward
System Components
Wall-hung boiler → Manifold → Underfloor piping loop → Return water → Wall-hung boiler
Advantages
- Highest comfort level (warm feet, cool head, aligns with traditional wellness principles)
- Doesn't take up wall space
- Even indoor temperature distribution
- Relatively low running costs (operates at low temperature)
Disadvantages
- Slow to heat up (takes 4-6 hours to warm up, needs to run continuously)
- Reduces ceiling height by 8-10 cm
- Difficult to repair (leaks require breaking the floor)
- Requires space for the boiler room
2. Radiators
How It Works
- Wall-hung boiler heats water (60-80°C) → Hot water enters the radiator → Convection + radiant heat dissipation
Advantages
- Fast heat-up (15-30 minutes)
- Flexible installation (surface-mounted / concealed)
- Easy to repair (surface-mounted pipes)
- Doesn't affect ceiling height
Disadvantages
- Takes up wall space
- Uneven temperature (hot near, cold far)
- Lower comfort level compared to floor heating
- Limited aesthetic options
3. Electric Floor Heating
How It Works
- Heating cable / graphene film is powered on → Direct heat generation
Advantages
- Simple installation, no boiler required
- Relatively fast heat-up
- Precise temperature control (independent control per room)
- No risk of water leaks
Disadvantages
- High running costs (electricity > gas)
- Not suitable for large whole-house areas
- Requires sufficient electrical circuit capacity
Comprehensive Comparison
| Feature | Water Floor Heating | Radiators | Electric Floor Heating |
|---|---|---|---|
| Comfort | ★★★★★ | ★★★ | ★★★★ |
| Heat-up Speed | ★ | ★★★★★ | ★★★ |
| Running Cost | ★★★★ | ★★★ | ★★ |
| Installation Cost | ★★ | ★★★★ | ★★★★ |
| Ease of Repair | ★ | ★★★★★ | ★★★★ |
| Space Occupied | 8-10 cm under floor | Wall space | 3-5 cm under floor |
| Lifespan | 50 years (piping) | 15-20 years | 30-50 years |
3. Running Cost Comparison
Reference for a 100㎡ Heating Season (4 months)
| Method | Monthly Cost | Seasonal Cost | Energy Source |
|---|---|---|---|
| Water Floor Heating (Gas) | 800-1500 CNY | 3200-6000 CNY | Natural Gas |
| Radiators (Gas) | 600-1200 CNY | 2400-4800 CNY | Natural Gas |
| Electric Floor Heating | 1200-2500 CNY | 4800-10000 CNY | Electricity |
| Air Source Heat Pump | 500-1000 CNY | 2000-4000 CNY | Electricity |
Costs are affected by regional gas/electricity prices, home insulation, set temperature, etc. For reference only.
Money-Saving Tips
- Room-by-room temperature control: Turn off or lower temperature in unused rooms
- Lower temperature at night: Dropping 2°C can save 5-8%
- Don't switch on and off frequently: Floor heating running continuously is more efficient than frequent on/off cycles
- Improve insulation: Door and window seals + thick curtains
4. Wall-Hung Boiler Selection
Types
- Standard Boiler: Thermal efficiency 85-92%
- Condensing Boiler: Thermal efficiency 105-110% (recovers heat from flue gas)
- Price difference: Condensing boilers cost 30-50% more but save 20-30% on gas
Power Selection
| Heating Area | Recommended Power |
|---|---|
| <100㎡ | 18-20 kW |
| 100-150㎡ | 24 kW |
| 150-200㎡ | 28 kW |
| 200-300㎡ | 32-36 kW |
Key Parameters
- Energy Efficiency Rating: Grade 1 indicates a condensing boiler
- Heating / Domestic Hot Water Dual Function: Combi boiler
- Low NOx Emissions: Mandatory in some cities
5. Floor Heating Pipe Selection
Common Pipe Materials
| Pipe Material | Temperature Resistance | Lifespan | Price | Application |
|---|---|---|---|---|
| PE-RT | 60°C | 50 years | Low | Entry-level water floor heating |
| PE-RT II | 70°C | 50 years | Medium | Mainstream choice |
| PEX-A | 95°C | 50 years | Medium-High | High-temperature floor heating |
| PEX-B | 95°C | 50 years | Medium | Best value |
| PB Pipe | 95°C | 50 years | High | High-end |
Pipe Spacing
- Near exterior walls / windows: 15-20 cm (tighter spacing)
- Center of room: 20-25 cm
- Bathroom: 15 cm (requires higher temperature)
6. Installation Pitfalls to Avoid
- ❌ No insulation layer under floor heating → 30%+ heat loss downward
- ❌ Installing solid wood flooring over floor heating → Use tiles or engineered wood for heated floors
- ❌ Choosing radiators that are too small → Buy bigger rather than smaller
- ❌ No loop balancing on the manifold → Uneven room temperatures
- ❌ No access panel → Manifold location must be serviceable
- ❌ Not considering circuit capacity for electric floor heating → 100㎡ requires approximately 8-12 kW
💡 Summary: For maximum comfort, choose water floor heating (for whole-house, continuous use). For flexibility, choose radiators (heat on demand). For small areas or spot heating, choose electric floor heating. The extra cost of a condensing boiler pays for itself in 2-3 years. Never skimp on the insulation layer. Remember: floor heating is 30% materials and 70% installation — choosing a reputable HVAC company is more important than choosing a pipe brand.