A Viessmann heat pump that transformed retirement plans
For Anthony Brooks, a homeowner in Suffolk, heating bills were the barrier between working life and retirement. His all-electric boiler was marketed as being “100% efficient,” but in reality, it left him with soaring energy costs, forcing him to put his retirement plans on hold.
That all changed when he made one simple switch: replacing the boiler with a Viessmann Vitocal 151-A air source heat pump, installed by renewable energy specialists Sunlite. In just four months, the system has saved him over £900 on heating bills — all without the upheaval of replacing radiators or pipework.
Why a “100% efficient” electric boiler led to high energy bills
Anthony’s home had no mains gas, so when his oil-fired boiler was retired, he chose an electric boiler. On paper, it seemed like a good choice, promising reliability and efficiency. But electricity costs are far higher than gas, meaning the boiler was ruinously expensive to run.
“I had been planning to retire,” Anthony recalls. “But the electric bills were so high that it was starting to look untenable unless something changed.”
That’s when he turned to Sunlite, a Viessmann VIP Partner, for advice on a long-term solution.
Sunlite’s approach: cost-effective heat pump installation
Sunlite’s priority wasn’t chasing the highest theoretical efficiency; it was achieving the greatest long-term savings. The team determined that a Viessmann Vitocal 151-A could deliver a Seasonal Coefficient of Performance (SCOP) of 3.1 using the home’s existing radiators, avoiding the need for disruptive pipework upgrades.
Pairing the system with the OVO Heat Pump Plus tariff, which caps electricity at 15p/kWh, reduced real-world running costs to under 5p/kWh, well below the cost of running the previous boiler or comparable heat pumps.
A £7,500 Boiler Upgrade Scheme grant further cut the upfront investment, making the change both practical and cost-effective.
Viessmann Vitocal 151-A: delivers above expectations
Since its installation in November 2024, the system has exceeded every prediction. Careful weather compensation controls and fine-tuned programming have lifted the SCOP to 4.2 — well above the expected 3.1.
- £900 saved in four months
- Running costs below 3.5p/kWh
- 77% reduction in carbon emissions, saving around 850kg of CO₂ annually (the equivalent of driving a petrol car 2,500 miles)
For Anthony, the impact has been life-changing, with lower bills, greater comfort, and the freedom to finally enjoy retirement.
Why real savings come from smart design and not just high ratings
Anthony’s experience shows that impressive efficiency ratings on paper don’t always translate into lower bills. Real savings come from a system designed around how a home actually uses energy — not just how it performs in perfect test conditions.
With the right design, the right tariff and the right installer, even older heating systems can achieve exceptional results.
As Sunlite installer Jon Miles explains:
“Efficiency matters, but what most people really care about is cost. The difference this system has made to Anthony’s life is huge. It shows that when a heat pump is properly specified and used effectively, the payback can be rapid.”
Final thought: why more homes should consider a heat pump
High energy costs can quietly dictate how we live, from daily routines to long-term plans. Anthony’s story shows how the right heating system can give you back comfort, freedom and a bit of breathing room in the budget.
It makes you wonder how many other households could ease the pressure, cut their carbon footprint and take back control of their energy future by making the same simple switch.
Sunlite is a Viessmann VIP Partner, working closely with one of the world’s most trusted heating brands to deliver high-performance heat pump systems.
If you’re ready to see how a heat pump could lower your bills, without the stress of major upgrades, get in touch with our team today.
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