Heating and Hot Water

Heating and Hot Water Services

If you are having issues with your heating system, don’t hesitate to call us and book a gas or heating engineer.

We know it can be frustrating in the winter waking up in the morning and realising there is no hot water or heating. If you have hot water but no heating, than you are the lucky one, because this means that your boiler is working. In this case the issues could be a radiator blockage or diverter valve stuck in one position just to mention a few problem.


Our gas and heating engineers are here to help you out.

Whether it’s repairing a broken gas boiler, you need a landlord certificate, HIU maintenance, your radiators are not working, your thermostat are not working, or you need a new central heating system to be installed, we’re here for you!


At MML Plumbing we specialise in boiler installations, whether your current boiler has broken down or has simply become unreliable, one of our professional Gas Safe registered engineers will install a new boiler. We know how important a boiler is in your home, so we try to come to your home, as soon as we can. We cover North, West, East and City of London.

  • Heat demand calculation
  • Heating Unit (HIU) maintenance
  • HIU installation
  • HIU commissioning
  • Balancing valves
  • Expansion Joint Bellows
  • Loss of pressure
  • Heating problem
  • Sludge in the system
  • Hot water cylinder
  • Immersion heaters
  • Balancing radiators
  • Radiator installs
  • Radiator leaks
  • Radiators noise
  • Thermostats
  • Thermostatic valves
  • System power flush
  • No Hot Water or Heating
  • Heating but no Hot Water
  • Leaking pipework and fittings
  • Broken Immersion Heater
boiler plumbing service

Radiator Power Flush

Over time the efficiency of your central heating system will be reduced. If the radiators in your home aren’t heating your rooms as quickly as they should, a power flush or Magna Cleanse Rapid flush might be needed. This could increase the efficiency of your central heating system by as much as 30%, meaning cheaper bills in the future.

But if your radiators are not heating up, the issue is not always a blockage. It could be pressure loss in the boiler just to mention a simple one, that is why we have to check your heating system health and give you advice what really need to be done.

So before you book a heating system power flush, get some advice from us at: 020 3877 0586, so we can save you time and money.

Why is power flushing needed?

When a central heating system is installed a dose of system protector like inhibitor is added to the water. This prevents corrosion in the form of ferrous oxide (rust).

Over time the amount of inhibitor in a central heating system can be reduced. This happens as a result of topping up the water in the system. System leaks, draining radiators or adding new radiators would all mean adding water to a central heating system.

Once the dose of inhibitor has been reduced the process of corrosion starts and ferrous oxide is created. This solid is kept suspended in the water as it flows at high velocity through the system, but it will settle as a dark sludge where the velocity of water flow is lower.

Water flow velocity is lowest at the centre of a radiator. As the sludge settles in the same part of the radiator it gradually builds up and forms a solid mass. This build-up prevents hot water from coming into contact with that part of the radiator panel and reduces the energy output of the radiator.

Radiators need to remain on for longer to reach the comfort temperature set for the room. This means the boiler is burning more gas as it’s working for longer than it would otherwise need to.

A power flush removes sludge and restores performance of the central heating system.

If you have this symptoms contact us so we can book you a plumber or gas engineer in North London.

boiler maintenance service

What is a Heat Interface Unit (HIU)?

A heat interface unit (HIU) is a box that looks like a boiler. It transfers the heat from the community heating network into your home’s central heating system. It makes heat available instantly, whenever required. You simply set the thermostat and heating programmer, as you would with a traditional boiler.

There is a heat meter inside the HIU. The heat meter measures how much heat energy you use. Heat is measured in kilowatts, shown as kWh on your statement.

You can view how much heat energy you use on your Smart Meter.

In new building sites they try to install only heating units and avoid gas boilers.

,,What we promise, We keep….’’