Why do it:

Upgrading or optimising LTHW systems improves heating efficiency, reduces fuel consumption, and lowers carbon emissions. Modern condensing boilers, variable speed pumps, and smart controls ensure water is heated only to the required temperature, maximising efficiency.

Typical Savings:

• Condensing boilers vs. older non‑condensing: 15–25% fuel savings.

• Optimised flow temperatures (e.g. 60–70°C instead of 80–90°C): 10–15% savings.

• Variable speed pumps & controls: 5–10% savings.

• Total potential: 20–35% reduction in heating energy costs.

• Example: A site spending £100,000 annually on heating fuel could save £20,000–£35,000 per year.

Typical Costs:

• Rule of thumb: £150-£500 per kW (Thermal)

• Condensing boiler (commercial/industrial): £10,000–£30,000 per unit depending on capacity.

• Variable speed pumps: £1,000–£3,000 each.

• Smart controls (weather compensation, BMS integration): £2,000–£5,000 per system.

• Installation & commissioning: £10,000–£20,000 per site.

• Ongoing costs: £1,000–£3,000 per year (servicing, calibration, controls updates).