When to replace a boiler? Signs your heating system needs an upgrade
Briefly

Older boilers can cause your energy bills to rise. If you've noticed an increase in the cost of your gas bill, an old or faulty boiler may be the culprit. A newer model may need less gas to reach the same outcome, therefore saving you money. Thomas added: "Savings very much depend on what system you are replacing and whether you are combining it with other technologies."
Knowing when to replace a boiler can be tricky. By replacing it too soon, you may be getting rid of a perfectly good boiler that could have lasted another couple of years, but leave it too late, and you could end up with no heating, no hot water, and an expensive repair bill. It's essential to weigh these factors before deciding.
Read at Homebuilding & Renovating
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