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Commercial unvented systems

Commercial hot water using Unvented Cylinders

High capacity commercial mains pressure unvented hot water systems

Commercial applications for the Gledhill Stainless Lite

When a capacity of over 400 litres of mains pressure hot water is required

 

An alternative now exists to that of a high cost single cylinder solution to high volume requirements. Stainless Lite cylinders may be coupled together to provide for bigger demands in volume.

There are certain advantages to such a solution. Utilising this method you will enjoy:

1. The accompanying 25 year guarantee

2. A reduction in delivery lead time over a bespoke cylinder as Stainless Lite are stocked nationwide

3. Easier installation and handling with multiple smaller cylinders rather than one large unit

4. A reduction in unit cost!

Below you will find two recommended methods of coupling together a pair of Stainless Lite unvented cylinders. Configurations can however be extended to incorporate any number of cylinders to meet with the required storage capacity.

Opting for multiple smaller cylinders can often work out cheaper than using a single larger unit. However, factors such as available installation space, a cost comparison and system design should be considered.

All Stainless Lite cylinders used in a multiple configuration should be fitted with the controls supplied with them and wired to comply with the requirements of the Building Regulation Approved Document G3. For example, all indirect models must be fitted with:

* P & T valve

* Dual control and overheat safety thermostat

* Energy cut-off 2-port zone valve

* Inlet control group consisting of pressure regulator, non-return valve and expansion relief valve

* Expansion vessel

 

Configuring multiple unvented hot water cylinders to work together

The configuration shown in Figure 1 should normally be used when there is only one hot water distribution network in the building. The cylinders in this configuration should have the same storage capacity.

Click on image to enlarge

 

The configuration shown in Figure 2 should normally be used when there is more than one independent hot water distribution network in the building. In such an installation, the cylinders coupled together may have different storage capacities because they supply different networks. The common boiler flow and return pipework (EF & GH) should be sized for the total primary design flow rate through all the cylinder heat exchangers coupled together.

Click on image to enlarge

Due to the cylinders in this configuration charging and discharging at the same rate i.e. the diversity factor will be one. For example, if the design primary flow rate through each cylinder is 0.2 L/s and the 3 cylinders are coupled together, the common boiler pipework (EF & GH) should be sized for 0.6 L/s primary flow rate. Therefore mains cold water supply pipework (CD) should be sized to take into account of the total maximum simultaneous hot water demand and the balanced cold water demand from the system. Normal loading factor methods can be used to calculate simultaneous maximum demand for the system design. This method takes account of the diversity of use of individual hot and cold water outlets supplied by the system.

Similarly the mains hot water supply pipework (AB) should be sized to take into account of the total maximum simultaneous hot water demand. Normal loading factor methods can be used to calculate the simultaneous miximum demand for the system design because this method takes into account the diversity of use of individual hot water outlets supplied by the system.

As shown in Figures 1 & 2, if the tundish outlets are combined, then the common discharge pipework (KL) should be sized to safely discharge the total combined flow from all the cylinders linked together. For further guidance refer to the Building Regulations Approved Document G3.

Model selection guide
Required capacity (litres) Models System configurations
Up to 400 Select from single cylinder range n/a
500 2 x 250L cylinders Figure 1 or Figure 2
600 3 x 300L cylinders Figure 1 or Figure 2
700 1 x 400L and 1 x 300L cylinders Figure 2
800 2 x 400L cylinders Figure 1 or Figure 2
900 3 x 300L cylinders Figure 1 or Figure 2
1000 1 x 400L and 2 x 300L cylinders Figure 2
1200 3 x 400L cylinders Figure 1 or Figure 2

Go to Stainless Lite unvented cylinder section...

 

 


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