When a 72 room care home in Surrey needed to reduce its operational carbon emissions by 20 per cent while maintaining a generous hot water supply during peak periods, the Rinnai design team provided the customer with three options based on the carbon production, energy usage, and operational costs. The new options were also compared to the existing traditional storage system.
The options included a Rinnai H1 gas-powered system of three N1600 Continuous Flow Water Heaters, a Rinnai H2 hybrid system made up of two 21kW heat pumps and three continuous flow N1300s, and a Rinnai H3 all-electric solution that utilises two 50kW heat pumps and two 48kW E-cylinders.
Over five years, the costs of each hot water system were clearly shown:
- Rinnai H1 natural gas system is the most cost effective at £52,806.30
- Rinnai H2 hybrid system is at £56,745.84
- Rinnai H3 all electric system amounted to £149,666.32 (the difference here is explained by electricity costing around 300 per cent more than gas)
As reducing 20 per cent of emissions was a key part of the customer’s ‘must-do’ objectives, all suggested systems were proven to perform to a cleaner standard than the existing traditional system. The Rinnai H1 natural gas, Rinnai H2 hybrid, and Rinnai H3 all electric systems offer carbon reductions of 14.9, 30, and 67.5 per cent respectively.
The potential energy savings to be made were:
- Rinnai H1 natural gas system offers a 14.9 per cent reduction.
- Rinnai H2 hybrid system sees a 27.1 per cent reduction.
- Rinnai H3 all electrical system yields a 39.7 per cent reduction.
The care home decided that the preferred solution for this particular property would be the H2 hybrid hot water system. The H2 system would offer a reduction in emissions by at least 20 per cent, as well as reducing the initial investment and forecasted operational expenditure by 21.7 per cent and 62.1 per cent respectively when compared to the H3 all electric system.
Rinnai continues to provide UK customers with a variety of low carbon and cost-effective technologies that encourage commercial and domestic decarbonisation. No matter the specific requirements of any site, Rinnai can offer the ideal customer solution.
