Manifold systems are widely used with underfloor heating and this same principle can be applied to wall hung radiators. By using an Emmeti manifold system in a point to point configuration you can greatly reduce the number of joints in your system, speeding up installation time and vastly reducing the chances of a leak.
Caption: Example showing a house with a Type 2 manifold system supplying each radiator individually upstairs with an UFH manifold system downstairs. A thermostat per zone provides individual control to each room.
T2 Manifolds for Wall Hung Radiator Applications
Conventional heating system design relies on a large bore 22-28mm flow and return (commonly in copper) installed in a ring circuit with smaller bore 10-16mm feeds to each radiator to ensure even flow is achieved. This type of system can be time consuming and disruptive to install; has high material costs and can be difficult to balance and control correctly. By using a manifold system, the large flow and return pipework is minimised and allows smaller bore, more flexible pipework to be used, making it ideal for new build construction as well as refurbishment, in both domestic and commercial projects.
Taking this approach a step further by using one of our Type 2 range of manifolds, which enables independent time and/or temperature control of each individual room or zone in the building. This allows the home owner or building occupier to tailor their heat to suit their lifestyles. This is proven to be a more accurate method for maintaining a comfortable temperature within a space as each thermostat is mounted in an optimum position rather than TRVs (Thermostatic Radiator Valves) which are fitted directly to the radiator. The use of a thermostat per room/zone makes it much easier to create ideal comfort levels and prevents the unnecessary heating of unoccupied rooms improving the energy efficiency of the building by up to 40%. (Research carried out by TACMA (the BEAMA Controls Group) at Salford University).
T2 Manifolds for Underfloor Heating Applications
Underfloor heating has become increasingly more popular in the UK because of its ability to provide an efficient and uniform heat. The radiant heat provided at floor level creates a large heated surface that dissipates heat evenly into the living space whereas a radiator will produce convection currents that rise to the highest part of the room, meaning that the majority of the heat is lost at ceiling height. This makes underfloor heating more efficient for two main reasons:
- The heat emitted is used more effectively, resulting in less wasted heat
- The heat required to enable this is generally delivered between 35-55oC compared with 65-75oC for radiators which means that the heat source will operate for a shorter amount of time and therefore use less energy.
These energy savings combined with silent running and increased flexibility for room layouts gives a solution that will add real value to a property.
Underfloor heating can work with a variety of heat sources such as gas and oil fired boilers as well as renewable technologies such as air and ground source heat pumps. It can also be installed to almost any floor type from concrete slab, timber joist and as a retro fit system over existing floors.
In addition to the pipe work a key component is the Underfloor Heating manifold and the associated controls. At Emmeti we offer an extensive range of high quality manifolds and controls plus all pipe and accessories required to form a full system solution.
Heating Manifold Types
Emmeti offer three types of manifold for heating applications, these are:
Type 1 (T1): These are distribution manifolds which are designed for wall hung radiator (WHR) systems with a Thermostatic Radiator Valve (TRV) and Lockshield valve (LS) on the radiator.
Type 2 (T2): These are distribution and control manifolds which are designed for either wall hung radiator or underfloor heating (UFH) systems. The manifold is fitted with an electrothermic valve fitted to the return bar and double regulating lockshield or flowmeter fitted to the flow bar to balance and control each circuit; this replaces the TRV and lockshield on a radiator. The electrothermic valves are controlled by a thermostat or programmable thermostat, via a wiring centre.
Type 3 (T3): These are commonly underfloor heating (UFH) systems only but can be used for radiator systems and have a temperature controller and pump to ensure that the water is at the correct temperature for the underfloor heating circuits, and there is sufficient flow for the greater length of pipe used.
How do Emmeti T2 Heating Manifolds Work?
Example of domestic building with installed Type 2 manifold system with Wall Hung Radiators.
Type 2 manifolds can be used in heating applications not only for radiator or other heat emitter based systems but also for underfloor heating/cooling systems using a separate low temperature heat source or mixing valve control set. For radiator based or perimeter heating systems time and temperature control is centralised at the manifold allowing individual room temperature control if required. No TRV is needed in the room itself which can be controlled by a room thermostat or programmable room thermostat.
The thermostat is wired back to the manifold via a wiring centre which requires electrothermic heads on the return bar. This method is in compliance with Building Regulations Part L1 (conservation of fuel and power) and best practice GPG301, 302 and GIL 59 (CHeSS).
The function of the TRV (temperature control) and the lockshield (balancing) are now integrated on the manifold. More importantly, the electrical interlock required by Building Regulations Part L1 is provided directly by the thermostats controlling room temperature.
About the Emmeti Topway T2 Pre-assembled Heating Manifold Range
This state of the art option is pre-assembled onto a metal bracket, making for quick and easy installation. It has an electrothermic body integrated for each return circuit, ready to be actuated by the electrothermic head. The electrothermic heads are connected to the room thermostats located in each room or zone, via a central wiring centre.
The manifold includes lockshields or flowmeters on the flow rail, with double regulating function for individual circuit isolation, and manual setting of flow control for heat balancing per radiator. It also includes automatic air vents and drain-off (filling) points as standard. All of these reduce commissioning time, no longer having to physically move to each room or zone to balance each radiator.
Central control for distribution, manual isolation by circuit or by floor, commissioning of each zone by balancing, system air venting and automatic “electrical” flow isolation when a room is up to temperature. This also allows individual circuit purging.
- Measuring of flow using flow meters, allowing reading of dynamic flow during balancing. Measuring of temperature using thermostats integrated into the ball valves, one on the flow and one on the return rail. These aid installation by allowing the installer to verify the hot water is flowing, and how much, as well as what flow and return temperatures are being achieved.
- Differential by-pass, to prevent pump wear and tear.
- Time/temperature wall stats, with set back facility, for the individual zones or rooms.
- Wiring centre, allowing boiler interlock and pump stop/start.
Individual room zoning
Installing this kind of system can save a significant amount of money on fuel bills. It is particularly appropriate for use with public access buildings, like offices, schools and hotels. However with the increasing emphasis on legislation to save energy in both new and existing homes, Emmeti Type 2 manifolds offer a cost effective solution to professional installers and specifiers in meeting today’s more stringent requirements.
By using a central manifold each room within the property is essentially a separate zone. Each room will have a wall mounted thermostat located in such a way that it will measure the room temperature more accurately than a conventional TRV (Thermostatic Radiator Valve). The thermostat will activate the relevant electrothermic head when a call for heat is required. The electrothermic head will be energised and open the circuit that is calling for heat sending heated water into the system. This ensures that only the room that is calling for heat is being heated at any given time which greatly reduces the amount of energy being generated by the heat source. A conventional system will deliver heated water to the entire system with each radiator being heated unless isolated. For example, a typical family will spend most of their evening in the living areas such as lounge, dining room and kitchen where there will be a heating demand, however in a conventional system the bedrooms will also be heated during this time regardless of heat requirement in the rooms. As each room reaches its desired temperature the electrothermic head closes the circuit which reduces the amount of heated water required. Room thermostats can be either simple electromechanical, electronic, or more sophisticated digital combined time and temperature units.
The Emmeti T2 Wall Hung Radiator & UFH Manifold Range
At Emmeti we offer a range of T2 manifolds for use with Wall Hung Radiators and UFH systems:
Key Benefits of Wall Hung Radiator Manifolds
For the Installer:
- Provides you with individual isolation of radiators at the manifold, if required. You are able to isolate parts of the system whilst the rest remains operational, reducing disruption for installation and maintenance.*
- Reduced installation time of between 30%-40% due to less joints and smaller pipe sizes.
- Quicker and easier for you to balance and commission the system. The central manifold allows accurate balancing of the system as the commissioning engineer can adjust the flow rate to each radiator depending on size and pipe length.*
- Gives you a reduction of up to 70% of joints, with virtual elimination of tees and elbows, therefore less chance of leaks
- Ensures that you have good accessibility in the event of a problem – No concealed intermediate joints under floorboards or inside walls limits the points at which a leak could occur to the radiator and the manifold, significantly reducing the time for fault finding.
- All joints are above ground and are easily accessible.
- By using a manifold system, the large flow and return pipework is minimised, allowing you to use smaller bore, more flexible pipework.
For the Main Contractor / Developer
- Gives you peace of mind. Having fewer and easier to access joints reduces the risk of delays and call backs.
- Allows you to improve planning, organisation and standardisation on site, benefitting the build program for your project.
- Benefits health and safety on your project, cuts down the amount of hot works on site. Pipe is simply run between manifold and radiator location, in one continuous length.
- Smaller bore, flexible Gerpex pipe (or similar) is used which is much easier to install providing potential time savings for your project.
For the Building Occupier / Owner
- Using a manifold system will enable you to tailor your heating to suit the building activities by allowing rooms to be controlled individually, preventing rooms being heated when unoccupied. This will offer up to 40% saving on energy consumption.**
- Using Gerpex MLCP pipe (or similar) with a manifold system promotes the smooth flow of water around the system, minimising running noise and giving you a more comfortable environment.
- Gives you the flexibility of central and individual control – when maintenance and repair is required (such as replacement of individual radiators), rather than isolating a whole system the service engineer can isolate the flow and return pipework of individual circuits without the need to drain the entire system. This minimises drain-down time, and reduces system recovery issues on re-commissioning.*
- In the unlikely event of a leak, you have the significant advantage of being able to isolate only the circuit that has the leak, whilst continuing to use the other radiators, until remedial work can be arranged.*
- Provides you with considerably reduced maintenance costs through less disruption, down-time, and maintenance engineer cost and time on site.
- Your manifolds can be installed in a convenient location such as a riser or service cupboard for easy access meaning less disruption to the building occupiers and ease of repair/ maintenance for engineers and contractors.
For the Specifier
- By specifying this system it allows you to add value to the project with an improved method of installation. This will optimise time on site whilst selling confidence to the client with ease of maintenance and reduced chance of leaks.
- Specifying a manifold system will allow your clients you to tailor their heating to suit the building activities by allowing rooms to be controlled individually. This will offer up to 40% saving on energy consumption.**
- Innovative concept that will distinguish your project from other designers.
- Manifolds give you a precise, neat design and layout allowing a convenient central location for ease of distribution, service and maintenance.