This is because all combination boilers have to warm the water up from cold as it is running and this takes a lot of energy, this is limited to gas supply so all manufactures limit the boilers to about 30KW and this is just enough to lift the water temperature up to 60 deg C if water flow is about 1.5 Gall/min.
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Company Registration: 4261333 - Corgi Registration: 171871 - VAT Registration No: 700883645
Unit 10, Lambourne Crescent, Cardiff Business Park, Llanishen. Cardiff. CF14 5GG
Telephone: 0845 2600 321 - Fax: 0845 2600 322

 
Heatforce
Unit 10, Lambourne Crescent,
Cardiff Business Park, Llanishen.
Cardiff. CF14 5GP.
TEL: 0845 2600 321
links myheatingservice.com mybathroomshowroom.com myfireplaceshowroom.com