A warm floor in a London home should not mean a heating bill you dread. Whether your underfloor heating belongs on all day, on a timer or on a low setback depends on the system under your feet, and Drainplumb works on both wet and electric systems across Greater London.
The Quick Answer
- Why wet systems suit steady low heat and electric mats suit timers
- How thermal mass decides warm-up time and cooldown
- Signs that point to a fault rather than a bad schedule
- Safe adjustments you can make and jobs to leave alone
Drainplumb is a plumbing and drainage business covering London. Customers also come to us for underfloor heating in City of Westminster, from repairs to new installations.
Get a quick quote from Drainplumb for your Greater London underfloor heating, or call 07401 062636.
Should underfloor heating be on 24 hours a day?
Underfloor heating does not need to be on 24 hours a day. A wet system in a well-insulated home often does best on a steady low setting, while an electric system under a thin floor suits timed bursts.
Describe your underfloor heating problem to Drainplumb and get a quick quote anywhere in Greater London.
How long it takes to warm up and what the schedule looks like
The answer comes down to warm-up time, and warm-up time comes down to thermal mass. A wet underfloor heating system laid in a screed floor holds a lot of heat. It can take many hours to come up to temperature and many hours to cool, so switching it fully off overnight and asking it to recover at 6am rarely works. For these systems, continuous operation at a low level, or a gentle night setback of a degree or two, is the common pattern in a properly insulated home.
Electric underfloor heating is different. Mats and cables under tile or a thin floating floor have little thermal mass, so they respond far quicker. A timer control that starts the heat before you wake and cuts it when you leave is usually enough. Leaving electric heating running all day and night through empty hours simply heats a floor nobody is standing on.
A few settings are worth knowing:
- Comfort temperature: the level you want while you are home and awake.
- Setback temperature: a lower holding level for night or days away, so the floor never goes fully cold.
- Programmable thermostat: lets you set the warm-up to start before you need it, rather than reacting once the room is chilly.
As a veteran of this work, I would say the biggest mistake is turning a wet system hard up to catch up. The floor responds slowly, so you overshoot hours later. Small, patient changes work better.
Signs that tell you where your system stands
If your floor takes most of a day to feel warm after a cold spell, you almost certainly have a wet system in a screed floor, and it prefers continuous operation with a setback. If it is warm within an hour or so, it behaves like a low-mass electric system and a timer will serve you well.
Other signs point to a fault rather than a schedule problem. Cold patches in an otherwise warm floor, a thermostat that reads normal while the room stays cold, or a system that never reaches the temperature you set can mean an air lock, a failed mat or a control fault, not the wrong timings. That is when underfloor heating repair is the answer rather than new settings. If you are searching for someone near you in Greater London, we cover underfloor heating in the Westminster area and across the capital.
Poor insulation under the floor is another common cause. Heat that escapes downward makes any schedule look inefficient, and no timer can fix it.
If you need underfloor heating in Islington, we cover that too, including underfloor heating installation in Islington where a floor is being fitted or renewed.
Describe your underfloor heating problem to Drainplumb and get a quick quote anywhere in Greater London.
What to do next
Start by finding out which type you have and what sits above it. Check the thermostat is a programmable one, set a modest night setback, and give any change several days before judging it, because a floor with thermal mass reacts slowly. Keep notes on what you changed and when.
If the floor stays cold in places, never warms, or the controls seem to ignore your settings, stop adjusting and have it looked at. Electric systems involve mains wiring, so do not open up thermostats or floor connections yourself. Wet systems involve manifolds and pumps that are best left to a plumber.
Describe the problem to us at no charge, and a written price follows before any work starts. We cover Greater London and the towns around it.
Describe your underfloor heating problem to Drainplumb and get a quick quote anywhere in Greater London.