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Plumbing

Find guidance on leaks, pipework, drainage, water pressure and everyday home plumbing issues.

Plumbing

Replacing Your Boiler: Types Of Boiler - The Condensing Boiler

It’s not something that we think about often, but your boiler is working hard, 24 hours a day, 7 days a week. Last week, we looked at the signs that you need to replace your boiler.

It’s not something that we think about often, but your boiler is working hard, 24 hours a day, 7 days a week. Last week, we looked at the signs that you need to replace your boiler.

Your central heating system needs to be chosen with care; it needs to be efficient enough to heat your home, but not oversized, which can lead to a rise in fuel bills and wasted energy.

When considering which boiler you need, you should take into account:

  • The size of your home;
  • The usual number of occupants;
  • If you use multiple showers and taps simultaneously;
  • The type of fuel that you use;
  • Your budget.

In this series, we look at the different types of boiler available, including condensing boilers, combi boilers, system boilers, regular boilers and the types of fuel available (gas, electric, oil fired and solid fuel boilers).

When they first hit the market, condensing boilers got a bad reputation. However, the product was developed and, since 2005, all new boilers installed in the UK have to be condensing boilers. Here’s why.

Condensing boilers

The Pros: Condensing Boilers are cost and energy efficient. They optimise the fuel that they burn, usually extracting more than 90% of the energy that they produce. Although condensing boilers cost a little bit more in the first instance, because of their efficiency and because they capture the energy from flue gases that would otherwise be wasted, they are better for the environment as well as your wallet in the longer term. Condensing combi boilers are a great idea if you are limited on space; you don’t need a water storage tank, and their compact, modern design makes them ideal for smaller houses and flats.

The Cons: Condensing Boilers are susceptible to freezing temperatures, when the pipe which leads from the boiler outside can freeze, stopping the boiler from working. This can be quickly fixed with warm water but can be inconvenient and could cause long term damage. It is worth insulating the external pipe to prevent this from happening. Because they are more complex, condensing boilers can be harder to fix than their older, simpler predecessors. The best way to avoid costly repairs is to get your condenser boiler serviced every year by a Gas Safe registered engineer.

Need a boiler service? Check our directory for rated boiler engineers in your area. Next week we will look at the pros and cons of combi, system and regular boilers; follow Trust a Trader on Facebook or Twitter to make sure that you don’t miss it.

Looking for more plumbing advice?

Find clear, practical answers to common plumbing questions, helping homeowners understand everyday issues, know what checks they can carry out safely, and when it is best to contact a qualified professional.

  • What should I do if I have a blocked drain or sink?

    Start with a plunger - create a good seal and use firm, steady pressure. For a kitchen sink blocked with grease, bicarbonate of soda followed by vinegar can help. If that's not shifting it, a drain snake reaches further down the pipe. Go easy on chemical drain cleaners as they can damage older pipes and rarely sort the root cause. If the blockage keeps coming back, affects more than one outlet, or you're getting unpleasant smells, call a plumber rather than trying to patch up the problem.

  • How can I tell if I have a hidden water leak?

    The most obvious clue is a water bill that's gone up without any change in your usage. Beyond that, listen out for running water when everything's turned off, and watch for damp patches on walls or ceilings nowhere near an obvious water source. A quick self-test is to turn everything off and watch your water meter - if it's still moving, there's a leak somewhere. Tracking down exactly where it is usually needs a specialist detection kit, which a plumber can bring in without having to rip everything up.

  • What should I do if I have a burst pipe?

    Turn off your stopcock straight away - you'll usually find it under the kitchen sink or where the mains water enters the property. Once it's off, open your taps to drain what's left in the system, switch off the boiler if you can do so safely, and mop up any standing water before it reaches electrics or flooring. Then call a plumber. With burst pipes, the faster you act, the less damage you'll be faced with.

  • What is a gas safety certificate and do I need one?

    A Gas Safety Record is issued by a Gas Safe registered engineer after checking that all your gas appliances, flues, and pipework are safe. Landlords in England, Scotland, and Wales are legally required to get one every year and give tenants a copy within 28 days. For homeowners it's not a legal requirement, but getting a check done alongside your annual boiler service is a smart idea, particularly in older properties. Only a Gas Safe registered engineer can carry out the work or issue the certificate - you can check anyone's registration on the Gas Safe Register website.

  • Why is my water pressure low and can a plumber fix it?

    Low pressure usually comes down to one of a handful of things: a stop valve that's not fully open, limescale build-up in older pipes, a failing pressure-reducing valve, or an issue with your water provider's mains supply. In most cases a plumber can sort it - though if the problem is with the mains itself, you'll need to contact your water company first. Either way, don't just live with it - ongoing low pressure can sometimes point to something more serious.

  • How do I know if my boiler needs replacing or just repairing?

    If it's under ten years old and it's one specific fault, a repair usually makes sense. If it's over fifteen, has needed multiple fixes recently, is making strange noises, or your energy bills have crept up for no obvious reason - replacement is probably the better investment. A useful rule of thumb: if the repair would cost more than half the price of a new boiler, it's probably time to replace it.

  • How often should I get my plumbing inspected?

    There's no legal requirement for homeowners, but every two to three years is a sensible habit - especially in older properties or hard water areas where limescale builds up over time. Your annual boiler service covers some of the associated pipework too. And if anything seems off between inspections - odd noises, discoloured water, unexplained damp - don't wait. Get it looked at sooner.

  • Why do my pipes make a banging or knocking noise?

    That banging sound (sometimes called water hammer) usually happens when water flow is suddenly stopped or redirected, sending a pressure wave through the pipes. It's most common after flushing the toilet, shutting a tap sharply, or when a washing machine valve closes. Pipes that aren't properly secured can also knock against walls or joists. It sounds alarming but it's often an easy fix - a plumber can figure out whether it's a pressure issue, a faulty valve, or just some loose pipework.

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If you have a question in relation to TrustATrader specifically, please check out the TrustATrader FAQs, with separate lists tailored to consumers and tradespeople. Alternatively, get in touch with our team. We're happy to help!