Boiler produces almost only hot water

[no1onshirt]

Hi,

i was wondering if someone can guide me with the following issue.

We recently bought a house and we have the following boiler. I have several questions

1. We get extremely hot water on our shower and we cant seem to understand how to change it. I believe i have seen the thermostat on the bottom right and tried to reduced the temperature but didnt help.
2. The pressure is not really strong. If you are in the shower on the first floor and someone opens another tab then the presssure is dropping and the water is becoming colder.
   
3. General question, as we are thinking of renovating, is it necessary to have such a big water tank for a 2 bedroom semi detached house?

Bare in mind we have got a certificate for that before we got in.

Thank you

 

[Deleted member 320418]

What you have is a system boiler and unvented cylinder. For the hot water temperature - check that the immersion heaters haven’t been left on and check the cylinder thermostat temperature as this should be around 60 degrees and controlled from a motorised valve in conjunction with your boiler. The immersion heaters just use electric.

What type of shower do you have?

 

[MGW]

This rings alarm bells to me. I am an electrician not a plumber, however I see a programmer and a base for a wireless thermostat, today we tend to use programmable thermostats, so we can alter the temperature through the day. The light only light bulbs mean we tend to want it warmer in the evening as no inferred from light bulbs any more.

The tank is handy if you ever have solar panels, our system uses excess solar in summer to heat DHW so don't need to run central heating in the summer.

I look at the boiler, looks very like my mothers combo boiler, can't understand why it has controls for DHW and CH on a system boiler, but the motorised valves point to system boiler. I can see two x two port valves which point to S Plan.

When I first moved into this house I had to get the heating guys in to replace the TRV's so I could use motorised TRV heads, and to fit valves to stop reverse flow, and I had to completely rewire the control, used original wiring, but I wonder how the previous occupants used the central heating as to turn it on I needed to go outside and down a set of steps to turn on pump, and although the programmer said DHW and CH it could not actually only heat DHW.

That cylinder may be a pressure vessel, if so it needs testing annually, so wait to see what plumbers say, but looking at that junction box I would say attention is required.

 

[Jimbo]

It looks like the wire from the immersion heater goes into a switch with a neon on the right hand side, presumably indicating it’s switched on.