Air source heat pump radiators are often larger than those used with a traditional boiler because heat pumps typically operate at lower water temperatures.

The exact size required will depend on factors such as your home’s heat loss, insulation and the system’s flow temperature. In many cases, existing radiators may still be suitable, although some may need to be replaced with larger or higher-output models.

A qualified installer will calculate the heating requirements for each room and recommend the right radiator sizes to keep your home comfortable while helping the heat pump run efficiently.

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Most homes can be suitable for an air source heat pump, including older properties, but the system needs to be correctly designed for the building.

An air source heat pump works best in a well-insulated home with appropriately sized radiators or underfloor heating. You'll also need a suitable outdoor location for the unit, with enough space around it for airflow and maintenance access.

Before installation, a qualified installer should assess your home’s insulation, heat loss, existing heating system and electrical supply. They can then confirm whether a heat pump is suitable and recommend any improvements that may help it run efficiently.

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In most cases, you don't need planning permission for solar panels on a domestic roof. In England, roof-mounted solar panels are usually classed as permitted development, which means you can install them without making a full planning application, as long as the system meets certain rules.

For pitched roofs, solar panels should not sit above the highest part of the roof, excluding the chimney, and should not project more than 200mm from the roof slope or wall. For flat roofs, the solar PV equipment must not be more than 600mm higher than the highest part of the roof.

You may need planning permission or prior approval if your property is:

• Listed
• Within the grounds of a listed building
• On a scheduled monument
• In a conservation area
• In a World Heritage Site

You may also need permission if the panels will be installed on a wall that faces a road.

Ground-mounted solar panels have their own rules too. These can cover the height, size, location, and number of panels allowed.

If in doubt, contact your local council.

Most solar panels last around 25 to 30 years, although they can often continue generating electricity after that. Their output gradually reduces over time, so older panels may produce less power than they did when they were first installed.

Many solar panels come with long performance warranties, often around 25 years, although this varies by manufacturer. A good installation, regular checks, and keeping the panels clear of heavy dirt or debris can help them work well for longer.

In simple terms, solar panels are a long-term investment. They should keep producing electricity for decades, but their efficiency will slowly decline over their lifespan.

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