UK energy supplier Octopus (www.octopus.co.uk) has announced a new heat pump installation offer that is expected to cost as little as £2,500 after government grants like the Boiler Upgrade Scheme are taken into account, making prices similar to that of a gas boiler install. British Gas (www.britishgas.co.uk) also announced its guarantee to provide the lowest quote, from £499 in Scotland and £2,999 in the rest of the UK. Costs will be higher if you require upgrades to insulation, radiators etc.