16 November 2016

How to connect Hep2O to a radiator

With autumn on the horizon, we’ve taken several calls from plumbers about connecting our Hep2O push-fit plumbing system to radiators. Here’s all you need to know. 

Considerations when connecting Hep2O to a radiator

Hep 2O pipe is compatible with most other makes of fittings, but when connecting it to cylinders and radiators, you should use Hep 2O fittings wherever possible.

The Hep 2O range includes double check valves, tank connectors, gate valves, stopcocks and cylinder connectors. If the use of compression fittings is unavoidable, then check out the jointing instructions outlined on page 24 of our Installer Guide, available to download here.

Things to remember:

  • Do not use any jointing compound on the jointing shoulder of the cylinder connector
  • Do use PTFE tape
  • Don’t use any jointing compound when fitting tank connectors
  • Do use sealing washers

Dry lined wall feeds for radiators

There are distinct advantages to using 10mm Hep 2O pipe instead of microbore copper feeds to radiators, one being that Hep 2O pipe can easily be accommodated behind ‘dot and dab’ to give a pipe-free appearance within a room. Unlike copper, it’s not prone to damage such as dents or kinks which can be caused on ‘soft’ copper by other follow-on trades.


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How to use our radiator outlet cover plate

A handy solution when using 10mm Hep 2O pipe is to utilise the HX113 Hep2O Radiator Outlet Cover Plate.

Fitted in conjunction with a back box, this cover plate provides a neat, easy-to-install method of connecting radiators. It also has the benefit of a hinged flap that provides an airtight seal.

The box is fixed in a central position behind the radiator with the 10mm pipes dropping out to the radiator valves. This gives a smart professional finish where little or no pipe is seen and, for new build, provides an anchor point for the pipework prior to plastering/boarding as shown below.


Hints for first-fix pipework

  • For conventional connections to radiators, the pipe drops should run vertically, side by side at one end of the radiator position
  • Where a radiator outlet cover plate is used, the radiator drops should run vertically, side by side, to the centre of the radiator position
  • Lateral pipes should be run horizontally through the stud work, avoiding any obvious fixing zones such as skirting boards
  • Where subsequent wall fixings are likely, metallic tape should be used to enable an electronic pipe detector to be used
  • For fixing pipework to lightweight blockwork, use wooden dowels at each clip position. The HX65 pipe clip is not suitable for fixing directly to such walls because of the low pull-out resistance of the nail.

How do you approach a SUDS design?

It’s absolutely about just understanding the site. So we’re talking Greenfield site here.

So the first thing you absolutely have to understand is the topography, because strangely enough water flows downhill as fast as it possibly can in the most direct move that it can. So you have to think about how the water naturally flows through the site, because if you put a building in the wrong place, even sites uphill can flood because you put it in the wrong place and the water will go in the backdoor and out the front door, no problem.

So we would look at topography and how we want to collect water across contours and how we’re going to convey it and where we’re going to take it to at the bottom of the site and where we’re going to discharge it. So that’s the simple approach.

As a landscape architect, if I’m master planning, then I’m going to be looking at trees, and hedgerows, and all the natural features, and the elements at the same time. And we’re going to start to allocate areas of the site to what the uses might be, understanding how we’re going to collect the water and how we’re going to store it and where in principle, but also because we want to have a hierarchy of measures in terms of our SUDS. Because if we put water through green systems, then we get improvements to water quality as it comes down the chain, what’s called the management train.

So we want to have a number of interventions that it goes through. And also we want to have a lot of these features and make them as close to where the water is falling on the ground, because the sooner we can intercept it, the sooner we can deal with it. So we’re looking at multiple interventions spread through a site in a hierarchy that all comes down towards the bottom of the site or where it can discharge. So if you’ve got waterfalls running along the site, you might have several or multiple discharge points. If you’ve got a single point where you can discharge or overflow from, then it will be towards the bottom or wherever that is.

All of these designs are completely one-offs for a site. There is not a standard solution. What there is is there’s an approach, and that it’s down to dealing with it on the ground.

To see more of our experts with water vlog series click here.

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