Which side is flow on a radiator?

Asked By: Wilhelmine Laderas | Last Updated: 17th June, 2020
Category: home and garden indoor environmental quality
4.9/5 (999 Views . 39 Votes)
Normally (but not necessarily!) the flow is on the left as you look at the rad.

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Likewise, which side of a radiator is the inlet?

Standard radiators (commonly known as compact radiators) typically have side valve inlets. These are located at the bottom of the radiator too but tend to allow access from the side only (horizontally).

Furthermore, which way does the water flow through a radiator? Water comes into the radiator from the upper hose at the left of the car, flows through the radiator from left to right, and is picked up at the lower radiator hose on the right side of the vehicle.

Just so, does it matter which side thermostat go on a radiator?

Many modern homes will have TRVs – Thermostatic Radiator Valves – attached to most of the radiators on the opposite side from the lockshield valves. A TRV should always be fitted to the inlet on the radiator and the LSV to the outlet.

Which way does water flow through a central heating radiator?

With a simple central heating system, each radiator has a basic screw valve at the bottom. If you turn the screw down, you switch the radiator off: the valve closes and hot water flows straight through the bottom pipe, bypassing the upper part of the radiator altogether.

37 Related Question Answers Found

How do I know if my diverter valve is faulty?

What are the symptoms of a faulty diverter valve?
  1. Hot water taps that only reach luke warm. If your sink, bath or shower is not running hot, it could indicate that there is a problem with the diverter valve.
  2. The water only gets hot if the heating is on.
  3. The water is hot, but the heating fails to come on.

Why are my radiators cold when the heating is on?

If the radiator is cold at the top and warm at the bottom it could be a case of having a trapped air bubble. When a central heating system is signalled to switch on, it sends hot water to radiators. If the top half of the radiator is warm but the bottom half cold it usually means a sludge problem.

Why is my radiator not getting hot?

2. Check for Trapped Air and Bleed Your Radiators. If just one (or a few) of your radiators aren't heating up, the most common reason for this is trapped air. If you've just turned the heating back on after the summer, air can become trapped in your radiators, causing them to be warm at the bottom but cold at the top.

Should radiator valves be fully open?

The further you move away from the boiler, you'll find the lockshield valve will have to be opened more. The last radiator may need to have the lockshield valve fully open to work at full efficiency. Your radiators are now balanced and should work perfectly.

How do you adjust a radiator valve?


  1. Ensure that the radiator boiler is on and operating.
  2. Find the wheel valve. This is located at the side of the radiator where the hot water enters.
  3. Open the wheel valve by turning it counterclockwise to provide more heat. To lessen the heat, shut down the valve by turning it clockwise.

What does the knob on the radiator do?

What that knob on your radiator is for. A lot of people mistakenly believe that the circular knob on a steam radiator regulates temperature, when it's actually just an on-off switch, says Peter Varsalona of RAND Engineering & Architecture. "It's not designed to be a control valve," he says.

Does it matter which side of radiator flow and return?

Should TRV's go on the flow or return pipe when fitting to radiators? Answer from Steve Harris, technical services engineer at Wavin: The vast majority of new TRV's are bidirectional and can be fitted to either the flow or return, but it is always good practice to fit them to the flow side.

When bleeding radiators where should you start?

If your home has 2 floors you should begin bleeding the downstairs radiators first. It's also advisable to start with the radiator which is furthest away from the boiler. Once you've bled all the downstairs radiators you move on to the upstairs, again beginning with the radiator which is furthest from the boiler.

How much should a radiator flush cost?

The cost of a coolant flush typically runs between $100 and $150, according to highly rated mechanics. Kauffeld says this can include four gallons of coolant, a conditioner and a cleaner. CostHelper.com estimates the cost between $54 and $144 for a radiator flush at a standard shop, with an average price of $99.

Why are some radiators hotter than others?


Some radiators occationally get quite a bit warmer than others. When this happens it usually means that your central heating system is out of balance. In some instances, radiators can be different temperatures due to the distance that water that heats them has to travel from the boiler or pump.

Should lockshield valve be open or closed?

As you progress further away from the boiler, the Lockshield valve will need to open slightly more. It's not uncommon for the Lockshield Valve in the first radiator to be open around one-quarter of a turn, while on the last radiator, it may need to be fully open.

Can you put a thermostat on any radiator?

Thermostatic valves can be fitted on any radiator, except the room where the main thermostat is located.

How does water flow through a cast iron radiator?

Because of this, many freestanding, cast-iron radiators have their pipe connections at the bottom of the radiator. The heated water enters the radiator and rises by convection, while the cooler water inside the radiator falls back to the boiler. Where there is no flow of hot water, there is no heat.

Where does coolant go when thermostat is closed?

The thermostat is located between the engine and the radiator. This little temperature-sensitive spring valve stays closed during engine warm-up. When the thermostat is closed, it prevents coolant from leaving the engine and circulating through the radiator until the correct running temperature is reached.

How is the radiator connected to the engine?


The radiator is linked to the engine by rubber hoses , and has a top and bottom tank connected by a core a bank of many fine tubes. The tubes pass through holes in a stack of thin sheet-metal fins, so that the core has a very large surface area and can lose heat rapidly to the cooler air passing through it.

How much water is in a home radiator?

A 1000x600 rad typically contains 5-6 litres of water, but it depends on design. You then have to lift the boards and calculate the water in the pipes, heat exchanger, etc.

How do I increase coolant flow?

Let's dive in.
  1. Increase flow through the cooling system. The flow through the cooling system can be increased by installing a water pump impeller designed to increase the flow rate of the coolant.
  2. Increase the cooling capacity of the radiators.
  3. Increase the pressure of the cooling system.