As we enter the budget planning period for 2027, improving hot water production systems may be one of the strategies many businesses are beginning to prioritize. This is especially true for enterprises requiring a continuous supply of hot water, such as hotels, hospitals, and industrial plants, where the hot water system is not just a part of energy expenses but also relates to service quality and operational continuity.
The International Energy Agency (IEA) states in its Energy Efficiency 2025 report that energy use in buildings accounts for approximately 30% of global final energy consumption. This figure covers all energy systems within a building. For budgeting a hot water system, one should start with actual site data according to the following checklist.
Table of Contents
1. What are the current costs and where is energy being lost?
Start by separating the energy consumption of the hot water system from the total electricity or fuel costs. If there are sub-meters or fuel logs, use that data as a baseline. If only a total bill is available, specify that the hot water system portion is an estimate and record the calculation method used.
Inspect the water heaters, tank and pipe insulation, set temperatures, and circulation pump operation. The inspection results will help determine whether to fix loss points in the existing system or budget for equipment replacement.
2. Do the heater and tank sizes support peak hot water usage?
Record daily hot water consumption alongside peak hour volume, temperature at the point of use, and periods of simultaneous usage. Hotels should look at data during high occupancy periods, while factories should look at shifts or production cycles.
Use this data to select the production capacity and storage tank size together, ensuring the heater has enough time to recover and refill the tank before the next usage cycle. If there are plans to increase rooms or production capacity, estimate the additional demand from the start.
3. Can the new system be integrated with existing equipment?
Survey how much additional power the electrical system can support, whether there is sufficient space for installation and maintenance, and which parts of the existing tanks, pipes, or control systems can still be used. Also, plan for system switching during installation so that critical points of use still have hot water.
If considering recovering waste heat from air conditioning or cooling systems to produce hot water, check if there is sufficient heat at the required temperature and time. If production and usage times differ, evaluate the storage tank capacity accordingly.
4. Which option offers the most appropriate total cost?
Compare improving the existing system, using new equipment alongside the old system, and replacing the entire system using the same hot water demand and evaluation period. Consider the payback period alongside the Life-Cycle Cost, which includes equipment and installation, energy, maintenance, repairs, and replacement costs, by calculating future expenses as present value.
For example, PAC Heatralized models with a COP of approximately 4.0 mean the unit uses 1 unit of electricity to provide approximately 4 units of heat energy to the water.
Compared to electric resistance water heaters providing the same amount of heat, this could reduce electricity consumption at the unit level by approximately 75% under comparable conditions. However, the actual system savings depend on usage patterns and all system components.
When budgeting, calculate based on actual temperature and usage volume, including energy for pumps and backup equipment, as well as losses from tanks and pipes. If the existing system uses fuel-fired boilers, use the efficiency and fuel price of the existing system to calculate costs at the same hot water load.
5. If a unit stops, can the system still supply hot water to critical points?
Identify usage points that require continuous hot water, the temperature that must be maintained, and the allowable downtime for each point. Then, determine backup capacity and methods for switching systems during equipment failure or maintenance.
Establish acceptance criteria before purchasing, such as the temperature and volume of hot water that must be supplied during peak hours, as well as testing procedures for switching to the backup system.
6. How will savings be verified after installation?
Define measurement points and collect data before system improvement to compare with post-installation data. Measure energy used, hot water volume, and inlet/outlet water temperatures, counting equipment within the same scope for both periods, such as water heaters and related pumps.
When usage volume changes according to occupancy or production cycles, adjust the comparison baseline according to the heat load the system must provide. This method helps evaluate savings from system improvements more accurately relative to actual operating conditions.
Budgeting for a Cost-Effective Hot Water System Starts with Understanding
Budgeting for a hot water system for 2027 does not always have to start with choosing new equipment. Instead, it should begin with understanding the current system, including energy costs, hot water usage volume, and existing system constraints.
With this data, businesses can compare options and plan investments more comprehensively, whether through improving existing systems or integrating new technologies. You can consult the PAC engineering team to help evaluate system suitability for actual usage patterns for cost-effectiveness and efficiency. Click
