Case Studies
Keep your radiators or start again? How a heat pump retrofit compares with a full system upgrade, when each makes sense, and where Heat Geek’s
November 4, 2026
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Keep your radiators or start again? How a heat pump retrofit compares with a full system upgrade, when each makes sense, and where Heat Geek’s
Viessmann’s popular Vitocal 150-A against the premium 250-A: outputs, flow temperature, built-in cylinder versions, quoted efficiency and UK availability compared.
Both are quiet R290 monobloc heat pumps reaching 75°C. We compare outputs, noise, energy ratings and installation to help you pick the right one.
Two premium R290 monobloc heat pumps compared on flow temperature, outputs, noise, hot water options and UK availability, so you can choose with confidence.
Heat pump or new gas boiler? We compare efficiency, running costs, suitability, installation disruption, lifespan and the Boiler Upgrade Scheme grant.
Monobloc or split? How the two air-to-water designs differ on refrigerant, installation, flow temperature and siting, with Vaillant and Worcester Bosch examples.
Air source or ground source? We compare installation cost, space, efficiency, disruption and the £7,500 grant, and explain why most homes choose air source.
A combi suits most flats and homes with one bathroom. A system boiler suits homes with two or more bathrooms. A heat only boiler suits
Both are high-quality ATAG combis with a stainless steel heat exchanger. Choose the iC for a dependable, compact combi, or the iC Economiser if you
Baxi’s numbering makes it simple: the higher the number, the higher the spec. Choose the 400 for a smaller home on a budget, the 600