Heating & Floor Heating Buying Guide: Heating Methods & Thermal Efficiency Comparison

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.

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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

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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

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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

1. Room-by-room temperature control: Turn off or lower temperature in unused rooms
2. Lower temperature at night: Dropping 2°C can save 5-8%
3. Don't switch on and off frequently: Floor heating running continuously is more efficient than frequent on/off cycles
4. Improve insulation: Door and window seals + thick curtains

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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

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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)

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6. Installation Pitfalls to Avoid

1. ❌ No insulation layer under floor heating → 30%+ heat loss downward
2. ❌ Installing solid wood flooring over floor heating → Use tiles or engineered wood for heated floors
3. ❌ Choosing radiators that are too small → Buy bigger rather than smaller
4. ❌ No loop balancing on the manifold → Uneven room temperatures
5. ❌ No access panel → Manifold location must be serviceable
6. ❌ Not considering circuit capacity for electric floor heating → 100㎡ requires approximately 8-12 kW

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💡 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.