Hot Water OPEX Calculator

Enter your facility's hot water demand and local energy rates. See the exact annual cost for electric resistance, LPG, and Karnot iHEAT — with savings calculated live.

A Karnot iHEAT R290 heat pump delivers hot water at COP 4.2 in Philippine tropical conditions — cutting hot water costs by 75-95% compared to electric resistance or LPG. A typical 25-room resort saves over ₱626,000 per year.

Litres per day
°C (Philippine mains ~28°C)
°C
PHP/kWh
PHP/kg
COP 4.0-5.0 typical in Philippines due to high ambient temperatures

Electric Resistance

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per year

LPG Boiler

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per year

Karnot iHEAT

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per year

Annual Cost Comparison

Electric
LPG Boiler
Karnot iHEAT

Savings vs Electric

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per year

Savings vs LPG

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per year

Free Cooling Bonus

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waste heat recovered / year

Total Annual Benefit

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vs next best alternative

Investment Payback

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Estimated System CAPEX
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Annual Savings (vs LPG)
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Estimated Payback

Carbon Emissions Comparison

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Electric (tonnes CO₂/yr)
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LPG (tonnes CO₂/yr)
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Heat Pump (tonnes CO₂/yr)

Ready to see exact savings for your facility?

Our engineers will size a Karnot iHEAT system for your specific demand, climate, and tariff schedule.

Talk to Our Engineering Team

Frequently Asked Questions

How much can I save switching from LPG to a heat pump for hot water?

Typical savings are 75-90% on hot water heating costs. A facility using 2,000 litres/day at Philippine energy rates saves approximately ₱480,000-626,000 per year compared to LPG, with a payback period under 1 year.

What COP does a heat pump achieve in the Philippines?

Karnot iHEAT R290 heat pumps achieve COP 4.0-5.0 in Philippine tropical conditions. Higher ambient temperatures of 28-35°C actually improve heat pump performance, making the Philippines an ideal climate.

What is the free cooling bonus?

Every heat pump has a cold side (evaporator) and a hot side (condenser). While heating water, the evaporator produces free cooling that can offset air conditioning loads. This recovered cooling is worth ₱50,000-200,000+ per year depending on facility size.

Can I still use my existing hot water distribution?

Yes. The Karnot iHEAT connects to your existing hot water pipes and storage tanks. No changes to distribution are required — it replaces only the heat source.

What about Scope 1 emissions from LPG?

LPG combustion produces direct Scope 1 CO₂ emissions that must be reported under SEC PFRS S2. Switching to a heat pump eliminates Scope 1 heating emissions entirely, moving to lower Scope 2 grid emissions — and at 4x less energy consumption.

Ready to Cut Your Hot Water Costs by 75%+?

Our engineering team can size a Karnot iHEAT system to replace your electric or LPG hot water heating.