Care in the community at its finest.
This was the way we did much the same with a simple thermal store. Didn't have the predictive bit - which is pure marketing hype for gullible pillocks.
View attachment 96879
Add this:
View attachment 96880
And hey presto - hot water.
View attachment 96879
View attachment 96880
You make me larf again. How crude. A simple latching relay and another cylinder thermostat to operate in summer? The programmer. Is 'ON' for space heating? It is confusing around the time switching.
You have
no using the heating pump as a shunt to get more energy into the cylinder.
No predictive logic to minimise the boiler switching in.
You do
not hold off the heating to a fast reheat for hot water.
No LED to see the temperatures of the sensors.
No individual control of the heating and hot water.
The hot water pump is
not variable speed so will pump at maximum speed hot water into the bottom of the cylinder
destroying stratification.
You do
not show the heating side, or heating pump or an expensive and
troublesome 3-way valve.
The user has to know the settings on the thermostats.
So you will have:
1. An expensive mechanical blending valve.
2. An expensive mechanical/electric flow switch.
3. THREE expensive rod type thermostats.
4. THREE expensive thermostat pockets in the cylinder.
5. A relay.
6. A wiring box.
7. An ugly round cylinder while the Systemate has a neat highly insulated box with controls behind a door.
All that is very expensive to what the Systemate has
The Systemate has:
1. Three GRundfos pumps.
2. three temperature sensors.
3. a pcb.
That is it!!!
And it does the hot water and space heating.
The cost? Three temperature sensors about £50 and a pcb of about £214. Less than £300. Far cheaper than the crude setup you showed. If you do thermal stores consider a Ekok pcb. They are readily available.
What the pcb does:
- The microprocessor pcb is self adaptive in that it learns the speed in which the boiler re-heats the cylinder and times the boiler to come in to re-heat right on time. This saves fuel and reduces boiler cycling.
- It holds off the CH pump when re-heating the cylinder to give priority for fast hot water production, holding off the CH pump until the stored water is over 60C, then the CH pump is allowed to come in and take heat from the boiler to the rads.
- It also learns the maximum temperature the boiler can give setting its own thermal store cylinder setpoint temperature.
- If the boiler can only heat to 78C it sets it at that. It heats the stored water from 76C to 82C determining the setpoint.
- The temperature of the stored water has to drop considerably before the pcb will bring in the boiler to reheat the cylinder preventing inefficient boiler cycling.
- The cylinder heating coil is large and will return very cool water back to the boiler so it works very well with condensing boilers, even models with modulating burners.
- It only returns cool water back to the cylinder when the hot water pumps operates maintaining stratification which holds off the boiler for longer before reheat.
- It uses the hot water pump as shunt pump to get more energy into the cylinder and no separate pump needed.
Your crude, expensive, thermostats and relay and all the rest can't hope to do what the pcb on the Systemate does. You don't even need to set anything on the Systemate it does it all. Fire and forget. And just three sensors and pcb do it brilliantly.
