A 400-Year-Old Tudor Mansion Just Chose Next-Gen Geothermal  And It Changes Everything Posted by  Robert Buluma | December 11, 2025 Deep in the rolling countryside of Suffolk, England, stands Kentwell Hall ,a moated, red-brick Tudor masterpiece built in 1563, complete with octagonal guard towers, a 16th-century long gallery, and gardens that have hosted queens. For centuries it has been heated (if you can call it that) by a wheezing, century-old oil boiler that gulps thousands of litres of heating oil every winter yet still leaves the 400-year-old rooms chilly and the fuel bills astronomical. That is about to change , dramatically, invisibly, and permanently. This week it was announced that Kentwell Hall has selected CeraPhi Energy , a British deep-geothermal pioneer, to carry out a world-first feasibility study and, if successful, install a closed-loop deep geothermal heating system that will make the entire estate net-zero with almost zero visible impact on the Grade I list...