hiflow.jpg (172697 bytes)DPS ShowerMaster   Patent applied for 9914072.5
Mains Pressure Hot Water Conversion Unit

Convert any standard boiler into a combination boiler,
without replacing or upgrading the boiler or any other existing components. 

Continuous, uninterrupted hot water, upon demand, without any need for hot water storage.

Obtain high pressure hot water supplies without pumps, unvented cylinders or electric shower units.

Provide high quality showers which do not suddenly go cold when other hot water outlets are open.

Do away with the cold tank and hot water cylinder completely, if desired.

The smallest conversion unit on the market, only 270mm wide x 350mm high x 120mm deep.

The DPS ShowerMaster is a self-contained unit designed to provide mains pressure domestic hot water from a boiler, without the need for hot or cold water storage. 

The ShowerMaster is retro-fitted to an existing system to provide an addition source of hot water.  The operation of the existing system is not altered, however the ShowerMaster will make full use of the boiler when mains pressure hot water is required at outlets, by-passing all other loads (such as the central heating  or a hot water cylinder).  As a result, the ShowerMaster can supply hot water at a rate limited by the size of the boiler.

The provision of an additional hot water source makes the ShowerMaster perfect for supplying a dedicated shower unit.   Unlike other systems where the hot water supply to the shower must be taken from the same source as all other hot water outlets, the use of a dedicated shower supply ensures that the shower will not suddenly go cold when another hot water outlet is opened.   Instead, the ShowerMaster supplies the shower, while the hot water cylinder supplies all other outlets.

In some cases, the amount of hot water that the ShowerMaster supplies is enough to supply the whole property.  In these situations it becomes possible to remove the existing hot water cylinder and cold water tank completely.  All hot water outlets can be fed from the Shower Master and all cold outlets fed directly off the mains.  The existing boiler remains, and should not need to be altered in any way.

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The ShowerMaster extracts heat from a boiler circuit and uses this to heat up mains cold water, as follows:
  1. A flow switch within the ShowerMaster detects when there is a hot water outlet open, and immediately operates a motorised three-port valve, redirecting the flow from the boiler through the heat exchanger.
  2. At the same time, the flow switch operates a relay switch which in turn switches on the boiler and primary pump, providing heat. The ShowerMaster bypasses demand from the central heating allowing the full boiler output to be utilised for hot water.
  3. The plate heat exchanger within the ShowerMaster transfers heat from the hot water in the boiler circuit flow to mains domestic water, thereby providing hot water to the taps.
  4. When all hot outlets are closed, the three-port valve redirects the boiler flow back to its usual route.
Numerous heat transfer plates within the heat exchanger keep the primary boiler water completely separate from the mains water, allowing each to operate independently at up to 5 bar pressure.  The heat exchangers themselves are tested to 10 bar pressure.

The ShowerMaster is fully assembled, wired and tested to ensure all components are working and that all pipework is leak free.   It comes in an attractive white metal casing, with three keyholes provided for easy wall mounting.

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ShowerMaster Output Graph:

The ShowerMaster can deliver hot water continuously at a rate determined by the input from the boiler.

The following graph shows the maximum flow rate that can be obtained from various sized boilers.  The four separate lines each represent different mains water temperature rises.

E.g. a rise of 35°C would be used for an incoming mains temperature of 10°C and a tap temperature of 45°C.

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Report on D.P.S ShowerMaster System
Installed at 2 Johnson Way, Greenhythe, Kent DO9 9LP

The ShowerMaster was installed at the premises of Mr Colin Bell, Service Officer for British Gas South Eastern.

THE BOILER SYSTEM:   Potterton Neataheat 6/10 upgraded to 10/16 with burner and injector change, connected to a fully pumped open vent system with 5 number radiators and a towel rail as a bypass with 2 zone valves having independent operation.

SHOWER:  Aqualiser Varispray 600 installed on a gravity domestic hot water system converted to a mains water pressure shower (using the ShowerMaster).

PLATE HEAT EXCHANGER:  D.P.S. SWEP B5.10 installed in the primary flow and return with a diverter valve operation via a manual switch. A Brefco pressure reducer (optional) was fitted on to the incoming mains water supply to hot and cold services. This was pre-set at 1 bar.

Boiler gas rate set at 1 cu ft /min.  The mains water was 13.6°C.

Boiler to heat from cold takes 4.58 min to shut down with a Flow temp of 88.5°C and Return temp of 84.5°C

After 1 min 30s:

Shower temperature was 52.0°C with no cold mix at a rate of approx. 8 litres per minute, at which time the boiler cut back in.

 Same flow rate after 3 mins:

Boiler flow temperature 60.3°C
Boiler return temperature 50.1°C
Shower temperature 52.2°C

Flow rate as above after 6 mins:

Boiler flow temperature 60. 3°C
Boiler return temperature 55.1°C
Shower temperature 52.2°C

The heat exchanger is also connected to all domestic hot water taps and with a flow rate of 4 litres a minute a temperature of 53.3°C was maintained.

The installation of this unit at this property has transformed an adequate shower into a quality shower with no moving parts (pumps) etc. It was added to an existing system with little inconvenience and was located within the loft space.

Operation can be fully automatic with clock control with minimal fuel consumption.

dpsdrop.gif (4795 bytes) Dedicated Pressure Systems Ltd.  
R/O Shops, 9-25 Manor Green Road, Epsom, Surrey KT19 8RA.
Tel. 01372 803 643,   Fax. 01372 803 678		 http://www.heatweb.com
e-mail:  DPS@heatweb.com