A hot water boiler heats water without changing its state to vapor. Because it operates at lower pressures and temperatures, it is generally easier to maintain, requires no IBR certification (in most cases), and has lower heat radiation losses.

Our units are highly versatile and can be equipped with burners for:

• Liquid Fuels: HSD (Diesel), LDO, or Furnace Oil.
• Gaseous Fuels: Natural Gas (PNG), LPG, or Propane.
• Dual-Fuel: Burners that can switch between oil and gas.

Oil/Gas boilers are much cleaner, more compact, and offer fully automatic operation. They don't require fuel storage yards, ash handling systems, or manual labor for feeding, making them ideal for urban or space-constrained areas.

• Vertical: Best for small-to-medium capacities where floor space is limited.
• Horizontal: Preferred for high-capacity industrial requirements as they offer easier access for tube cleaning and maintenance.

At indianboilers.com, our oil/gas fired hot water boilers achieve an efficiency of 88% to 92%. Efficiency can be further improved by adding a waste heat recovery unit.

Standard units go up to 90°C – 95°C. For specialized applications requiring "Pressurized Hot Water" (up to 140°C), we offer custom-engineered IBR-certified high-pressure models.

Our range starts from small 50,000 kcal/hr units up to large industrial systems of 5,000,000 kcal/hr.

We use high-precision Digital PID Controllers or PLC systems that modulate the burner. The burner automatically fires or shuts down based on the set-point temperature, ensuring consistent heat and fuel savings.

Yes. To ensure uniform heating and prevent localized boiling, a centrifugal pump is used to circulate water through the boiler and the process heat exchangers.

• Hospitality: Centralized hot water for hotels and laundries.
• Healthcare: Sterilization and HVAC heating in hospitals.
• Food & Dairy: Pasteurization, CIP (Clean-In-Place), and washing.
• Textiles: For dyeing and finishing processes requiring moderate heat.

Absolutely. It is the most efficient way to provide centralized heating for large commercial complexes, worker colonies, or industrial warehouses in cold climates.

Hot water boilers operating below 100°C are generally Non-IBR. This is a major advantage as it eliminates the need for annual government inspections and the requirement of a certified boiler attendant.

• Flame Safeguard: Shuts off fuel if no flame is detected.
• Over-Temperature Cut-off: Prevents the water from turning into steam.
• Low Water Flow Switch: Protects the boiler tubes from overheating if the pump fails.

Maintenance is minimal. It involves a monthly burner service (cleaning the nozzle and filters) and a periodic check of the electrical terminals. Since the fuels are clean, there is very little soot buildup.

Yes. Scaling is the biggest enemy of any boiler. Using a Water Softener is mandatory to prevent calcium buildup, which reduces heat transfer and increases fuel consumption.

Pricing is capacity-dependent. Estimated 2025 rates at indianboilers.com are:

• Small (1 Lac – 3 Lac kcal/hr): ₹600,000.
• Medium (5 Lac – 10 Lac kcal/hr): ₹7,00,000 – ₹15,00,000.
• High Capacity (20 Lac+ kcal/hr): ₹25,00,000+.
• Prices vary based on the choice of burner brand (Riello, Bentone, etc.) and automation level.

The kcal/hr capacity, the type of fuel (Oil vs. Gas vs. Dual), and the Control System (Standard vs. PLC-based) are the primary cost drivers.

While fuel costs are higher than biomass, the ROI comes from zero labor costs, minimal maintenance, and compact size. Most businesses see a full ROI within 12 to 18 months due to high operational uptime.

Visit indianboilers.com and use our "Request a Quote" form. Please specify your required water temperature and flow rate (LPH) for a detailed technical and commercial proposal.