Advice on smart thermostat/RF

[bettyflo]

825 is way too small. doesn't matter if you only have 4 out of 7 rads on at any one time, your plumber needs to calculate for the house and not just for you. 825 is suitable for a 1 bed/1 bath flat, you need the 830 or even better the 835. I prefer the ecotoc plus, its a bigger boiler and has SS heat exchanger and has been around for years and reliable. ecofit pure is relatively new but I fit them as they have a rear flue outlet which is very handy and they fit in a kitchen cupboard very nicely. They have a cast aluminium heat exchanger but as long as the system is flushed properly and chemically treated you shouldn't have any problems.

Oh really?I was wondering about this as my neighbours (same flat as mine) has a 35Kw combi fitted last year, not a 25kwh.
Would this 835 give me better pressure in the sower than the 825?

 

[Harvest Fields]

825 is way too small. doesn't matter if you only have 4 out of 7 rads on at any one time, your plumber needs to calculate for the house and not just for you. 825 is suitable for a 1 bed/1 bath flat, you need the 830 or even better the 835. I prefer the ecotoc plus, its a bigger boiler and has SS heat exchanger and has been around for years and reliable. ecofit pure is relatively new but I fit them as they have a rear flue outlet which is very handy and they fit in a kitchen cupboard very nicely. They have a cast aluminium heat exchanger but as long as the system is flushed properly and chemically treated you shouldn't have any problems.

You tell the OP that the engineer should calculate the size of the apartment and that the boiler is to small but then you proceed to tell the OP they need an 830 or a 835?? Have you seen or measure and calculated the correct size of boiler needed for the apartment or are YOU just guessing?????

 

[djchristoff]

Just guessing as I don’t have havent seen the flat or have access to any calculations for the flat but a 25kw boiler is not big enough based on how many bed and bathrooms they have. What i should have said is you need an 830 or an 835 but would need to do the calculations first.

To the OP, an 835 would give a better hot water outlet to the shower but would also depend on incoming mains pressure and flow etc...

 

[ShaunCorbs]

Just guessing as I don’t have havent seen the flat or have access to any calculations for the flat but a 25kw boiler is not big enough based on how many bed and bathrooms they have. What i should have said is you need an 830 or an 835 but would need to do the calculations first.

To the OP, an 835 would give a better hot water outlet to the shower but would also depend on incoming mains pressure and flow etc...

Depends one bathroom-might have an electric shower

Unless your running a bath 25kw is big enough

 

[bettyflo]

To the OP, an 835 would give a better hot water outlet to the shower but would also depend on incoming mains pressure and flow etc...

thanks a lot. The flow is over 22l per minute but I don't know the pressure.

 

[Harvest Fields]

thanks a lot. The flow is over 22l per minute but I don't know the pressure.

You will not get 22l/m from a 25kw combi boiler.

 

[bettyflo]

You will not get 22l/m from a 25kw combi boiler.

Oh I don't expect that, but at the moment the pressure is ridiculous and I have a salamander pump!

 

[Harvest Fields]

Oh I don't expect that, but at the moment the pressure is ridiculous and I have a salamander pump!

No problem. You also cannot fit the pump onto the combi also.

 

[ShaunCorbs]

No problem. You also cannot fit the pump onto the combi also.

Where did you measure the flow from bath taps ?

 

[bettyflo]

Where did you measure the flow from bath taps ?

flow was measured by the plumber from the sink in the kitchen which is right by the boiler.

 

[bettyflo]

No problem. You also cannot fit the pump onto the combi also.

Yeah, sadly I realised that. This has me a little worried as I would like good pressure in the bathroom shower, instead of this dribling. The shower is over bath. It has a thermostatic bath and shower mixer. The pump has a hot water and cold water feeds, though there is only good pressure when I turn the mixer to hot.

 

[bettyflo]

Where did you measure the flow from bath taps ?

I did not measure it, nor did the plumber. At present it is a gravity fed system with a pump. The hot water pressure at the shower is good, but the cold water is weak. However, next to those is a sink where the cold water pressure is good. Go figure!

 

[Gasmk1]

i would imagine your cold to the shower could be tank fed not mains as the sink will be the shower feed should be equal pressure on hot and cold or there is a pressure reducing valve on the cold to the shower which has gone faulty or the filter could be blocked.