How to Select Heat Pump?

01. Identify Daily Hot Water Requirement

General Guidelines (Indian Usage Patterns):
  • Per person: 30–50 liters/day
  • Per bathroom: 100 liters/day
Example Calculation: Family of 5 with 3 bathrooms
  • 5 people x 30L = 150L
  • 3 bathrooms x 100L = 300L
  • Select based on higher of two = 300L tank size

02. Decide Heat Pump Capacity (kW)

Use this rule of thumb:
Tank SizeSuitable Heat Pump Capacity
150–200 L2.5 – 3.5 kW
300–500 L4 – 6 kW
500–1000 L7 – 10 kW

Note: Choose a higher kW for faster recovery if usage is during peak times like morning/evening.

03. Consider Indian Climatic Zones

RegionMin TempRecommended
North India (Delhi, Himachal, etc.)5–15°COpt for low ambient temp heat pumps with defrost
South & Coastal India (Chennai, Kochi)20–30°CStandard heat pumps work well
Central & Western India (Gujarat, MP, Maharashtra)10–25°CMedium ambient units

Note: Select units that can work efficiently down to 5°C if you are in a colder region.

04. Check for Water Quality Compatibility

Many Indian regions have hard water, so choose:
  • Coated or Glass-lined tanks (anti-corrosion)
  • Models with inbuilt anode rods or descaling systems
  • Install Water Softner in Water Inlet

05. Select Tank Type

  • Integrated Type: Heat pump + inbuilt tank (Easy for Flats)
  • Split Type: Separate tank & heat pump (Flexible placement, space-saving)

06. Choose Based on Power Supply

Ensure the input power requirement matches your home:
  • Up to 3.5kW: Single-phase 230V
  • 4kW and above: Some may require 3-phase 415V

07. Energy Efficiency & COP

  • Look for COP (Coefficient of Performance) ≥ 3.5

08. Check Brand Service & Spare Availability

Stick to brands with:
  • Local service support
  • Spare parts readily available
  • Proven installations in Indian homes

09. Decide on Installation Location

  • Outdoor installation is preferred
  • Ensure good air circulation and drainage for condensation
  • Avoid dusty areas or closed rooms

10. Add Optional Features

  • Smart controller or app connectivity
  • Backup heating (for extreme cold)

Sample Product Match (Example)

For a 5-person home in Ahmedabad:
  • 300L Tank
  • 4.2 kW Heat Pump
  • Works at 5°C ambient
  • Glass-lined tank
  • COP ≥ 3.7
  • HDPE/CPVC plumbing compatible

01. Understand the Application Type & Usage Pattern

ApplicationTypical Use Pattern
HostelMorning & evening peak usage
Hospital24×7 usage across wards, labs, kitchens
HotelContinuous but peak during mornings & check-ins
DormitoriesSimilar to hostels

02. Estimate Hot Water Demand

Use these standard assumptions:

Hotels / Guest Houses

  • Per Room: 100–150 L/day
  • Add for kitchen, laundry, staff

Hospitals

  • Per Bed: 100–150 L/day
  • Add for OT, kitchen, central sterilization, etc.

Hostels

  • Per Person: 50–75 L/day (depending on facility)
  • Add for common washrooms

Tip: Use the peak hour demand for sizing capacity.

03. Select Tank Volume Based on Usage Pattern

Usage PatternStrategy
Peak Load (Hostel/Hotel)Higher storage tanks with slightly lower kW (store & use)
Continuous Load (Hospital)Higher kW with lower tank (continuous heating)

04. Heat Pump Capacity (kW) Selection

Application SizeRecommended Capacity
Small hostel/hotel (10–20 rooms)10–20 kW
Mid-size facility (30–60 rooms/beds)20–40 kW
Large hospital or hotel50–100 kW+ (can use multiple units)

Rule of Thumb: 1 kW can heat ~215–230 litres of water per hour (∆T = 35–40°C)

05. Choose Between Single or Modular Heat Pump System

OptionWhen to Choose
Single large heat pumpSpace is limited, load is fixed
Multiple smaller heat pumps (modular)Load varies, redundancy needed, service continuity

Modular systems allow for staggered running, energy saving, and backup support.

06. Consider Indian Climate Conditions

Location
Cold climate (North India)Low ambient temperature models with defrost
Moderate/Warm (Gujarat, Maharashtra, South)Standard models work efficiently

Must work efficiently at ambient temp down to 5°C in winter zones.

07. Water Quality & Tank Selection

Hard Water? Use:
  • SS316L Secondary Heating PHE
  • Glass-lined or Epoxy-coated tanks
  • Sacrificial Anode Rods
  • Install Softner in Water In

08. Space & Installation Planning

Prefer outdoor installation with proper ventilation
Allow space for:
  • Heat pump units (footprint & service clearance)
  • Buffer tank room
  • Booster pump & plumbing
Ensure vibration-free civil base and proper condensate drainage

09. Decide on Supporting Accessories

  • Hot water circulation pump
  • Booster pumps (for pressure to upper floors)
  • Temperature control valves
  • Insulated piping (PUF / Armaflex)
  • Automatic backup heating (for critical hospitals)

10. Prioritize Safety, Efficiency & Automation

FeatureBenefit
Backup electric heaterEnsures hot water during breakdown
High COP (≥3.5)Energy savings
Auto-defrostFor low ambient areas
Safety valves & temp sensorsProtect system and users

Example Sizing (For Reference)

30-Room Hotel in Ahmedabad
  • Rooms: 30 × 120L = 3600L/day
  • Peak usage in morning: 70%
  • Tank size: 2500–3000L
  • Heat pump: 15–20 kW
  • Use 1 or 2 booster pumps for pressure

Final Step: Brand & Support

Choose a brand with:
  • Proven commercial installations
  • Indian service backup
  • Local spare availability
  • Design & installation assistance

01. Understand the Pool Type & Application

TypeConsiderations
Indoor PoolNo heat loss from wind or sun, but ventilation needed
Outdoor PoolSubject to ambient temperature, wind, and evaporation

Outdoor pools require higher capacity heat pumps due to environmental heat loss.

02. Determine Pool Volume (in Litres or m³)

Formula:

Volume (m³) = Length × Width × Average Depth

1 m³ = 1000 litres

03. Define Desired Water Temperature

Pool UseTemp (°C)
Recreational28–30°C
Therapy32–34°C
Competition26–28°C

Higher temperatures need larger or more efficient heat pumps.

04. Identify Seasonal Usage

Season of UseKey Requirement
Summer OnlyStandard unit
All Year (Incl. winter)Low ambient temp heat pump
Monsoon/Winter OnlyMust include defrost function and stronger heating

For North India (cold winter), choose a unit working down to 5°C or 0°C ambient.

05. Estimate Heat Load Required

Formula:

Heat Load (kW) ≈ Pool Volume (Litres) × Temperature Rise × 0.001163 / Hours to Heat

Example:
  • Volume = 50,000 L
  • Temp rise = 10°C
  • Hours = 24

= 50000 × 10 × 0.001163 / 24

≈ 24.2 kW

You’d select a 25 kW heat pump units.

06. Check for Features Needed for Indian Conditions

Outdoor Pool (India):
  • Must be weatherproof & UV-resistant
  • Titanium heat exchanger (resistant to chlorine/salt)
  • Low ambient operation with defrost
  • Auto on/off with temperature sensor
Indoor Pool:
  • Lower capacity is acceptable
  • May need humidity control/ventilation
  • Still need corrosion resistance for moist air

07. Select Number of Units

SituationRecommendation
Large pool (50,000–200,000 L)Use multiple units for redundancy
Budget or staged usageUse 2 or 3 units with staggered controls

08. Pump Compatibility & Flow Rate

  • Ensure sufficient water flow through heat pump (flow rates vary by model)
  • Use booster pump if pool circulation pump is weak
  • Include bypass valve system for service and flow control

09. Energy Efficiency (COP)

  • Prefer COP ≥ 5 in Indian climate
  • Look for inverter-based models for energy saving & silent operation

10. Materials & Plumbing

  • Use CPVC or HDPE for piping
  • Insulate all hot water lines
  • Ensure NRV, isolating valves, drain valves are installed for safety and service

Installation Site (Civil Considerations)

InstallationTips
OutdoorKeep 1 ft. clearance around for airflow, proper concrete slab
IndoorDucted ventilation, space for heat rejection
Pool RoomAllow access for service, water drainage for condensate