Derwent Manor Hotel: Biomass Heating
project snapshot
Northumberland Hotel, Leisure Centre & Spa
| System | 6 x 60kW wood pellet biomass boilers (360kW total) |
| Payback period | 4 years |
| Internal rate of return | 21.14% |
| Annual heating cost saving | £26,000 (from £58,000 to £32,000) |
| GHG reduction | 78% |
| Annual carbon reduction | 65% |
the client
Luxury hotel, spa and leisure
Derwent Manor Hotel is a luxury hotel, spa, and leisure facility near Allensford in Northumberland. The main hotel building covers approximately 9,000 sqm across single, two, and three-storey structures, with six self-contained guest suites in a separate building opposite. Facilities include a 14-metre heated indoor pool, sauna, spa, and extensive leisure and communal areas.
the challenge
Single fuel source
The hotel complex was running three separate heating systems using three different fuel types - LPG for the main hotel, heating oil for the leisure centre, and electric heating for the self-contained suites. With ageing, increasingly unreliable boilers and no option for mains gas supply, the owners wanted to standardise on a single fuel source.
Rising heating costs - running to around £58,000 per year - combined with a clear ambition to reduce the site's carbon footprint, led the business to explore biomass as a solution. The rural setting and the expectations of the hotel's clientele made the environmental credentials of any new system an important consideration.
route to a solution
Designing the infrastructure
Practical Energy Solutions (PES) team carried out comprehensive heat-loss surveys and thermal imaging across the entire site to determine the appropriate system size. The assessment concluded that six 60kW biomass boiler units would meet the site's needs - three dedicated to space heating and three to hot water supply for the hotel, self-contained suites, pool, spa, and leisure areas.
The units were sited in an available storage building adjacent to the self-contained accommodation, chosen specifically to allow flue venting to be positioned away from guest areas.
The infrastructure to distribute heat across the site was designed and installed by the team, comprising:
- Underground pipework connecting the biomass building to the main hotel, guest suites, leisure centre, spa, and pool
- Heat exchangers at each point of transfer
- New hot water tanks and associated controls
- A suction feed system delivering pellet fuel continuously to the boilers with minimal intervention
the system
Final installation
The six boilers are configured as a cascade - one unit carries the base load, with a second brought online automatically if demand approaches 90% of capacity. The lead boiler rotates on a schedule to distribute wear evenly across the units, extending their working life and reducing maintenance requirements.
The cascade configuration also provides built-in redundancy: if one unit unexpectedly reduces output, the others absorb the load, protecting guests from disruption. Pellet fuel deliveries are made discreetly to a dedicated storage area at the rear of the biomass building.
Significant savings
The system locks in a levelised energy cost of 7.6p per kWh for 25+ years, protecting the business against future energy price rises.
| Pre-biomass | Post-biomass | Impact | |
|---|---|---|---|
| Annual heating fuel cost | £58,000 | £32,000 | £26,000 saved annually |
| Fuel types | LPG, heating oil, electric | Wood pellet | Standardised to single fuel |
| GHG emissions | Baseline | -78% | 78% reduction in greenhouse gas emissions |
| Carbon emissions | Baseline | -65% | 65% annual reduction |
The system locks in a levelised energy cost of 7.6p per kWh for 25+ years, protecting the business against future energy price rises.
site emissions
ECG and wider benefits
The reduction in carbon emissions aligns with the expectations of the hotel's clientele and supports the business's wider ESG commitments. The move away from fossil fuels is something the hotel can communicate directly to guests - a meaningful consideration for a luxury destination audience increasingly attentive to sustainability credentials.
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Thinking about biomass for your business?
This project shows what's possible when a complex, multi-building heating challenge is approached systematically. If your business has high, consistent heat demand and limited access to mains gas, biomass could be worth exploring.