2 different boilers on CH system replacement quotes

[Phill Peck]

This combi boiler runs 2 showers at once no problem.

Ignore what's on the quote.
Talk to your installer explain what you want.
If you trust him go with his recommendations.
The job of the above picture was for a customer who was told that they could not have a combi by several installers.
Requirement was
2 people 90% of the time but want to be able to run 2 showers/outlets together.
No stored water in the loft
No noisey pumps.

Job done

 

[Tirglas_7]

What kW rating is that one?

Isn't that a cylinder at the bottom?

 

[Dan Robinson]

Isn't that a cylinder at the bottom?

No its an accumulator.

 

[Phill Peck]

What kW rating is that one?

Isn't that a cylinder at the bottom?

No better(in this case)

 

[endecotp]

Isn't that a cylinder at the bottom?

In order to run two showers you need (a) enough heating capacity and (b) enough water pressure from your main supply. That accumulator is to help with (b).

 

[Tirglas_7]

Ah ok to store pressure and deliver when needed? I've dealt with them in aircraft hydraulic systems, I imagine it's the same principal.

So if my mains is at 6 bar I shouldn't require anything like that right?

Thanks again for the replies to what are probably tedious questions!

 

[Dan Robinson]

 

[Dan Robinson]

 

[Dan Robinson]

Not on a combi though.

 

[Phill Peck]

Ah ok to store pressure and deliver when needed? I've dealt with them in aircraft hydraulic systems, I imagine it's the same principal.

So if my mains is at 6 bar I shouldn't require anything like that right?

Thanks again for the replies to what are probably tedious questions!

If u understand aircraft hydrolic systems(I'm not sure I do/would)
I'm not sure I need to explain volume/flowrate/pressure

 

[endecotp]

So if my mains is at 6 bar I shouldn't require anything like that right?

Probably not, though it's possoble to have situations where the pressure is initially good bit drops as soon as you take any flow i.e. you're at the end of a long narrow pipe.

 

[Tirglas_7]

If u understand aircraft hydrolic systems(I'm not sure I do/would)
I'm not sure I need to explain volume/flowrate/pressure

I do understand aircraft hydraulic systems on aircraft I've worked on. The ones I'm familiar with are sealed pumped systems at 280 bar fed under all conditions , accumulators are used for emergency one shot power generation when both hydraulic systems suffer catastrophic failure.

I'm looking for advice from people in the know, just because I know how an aircraft hydraulic system works, doesn't give me the experience of having installed different HW/CH systems and experienced their resulting levels of success.

Can anyone tell me which is the most cost effective method, including purchase/installation/ running costs?

 

[Tirglas_7]

I take it the accumulator can be added at later date should issues be found?

 

[Dan Robinson]

Indeed.

As to the best options.....very tricky to give sound advice on the internet. Only you can decide the best system type.

Ignore any nonsense about combi boilers bring more complicated and unreliable. Concentrate on the performance tables and the actual incoming supply.

Personally I prefer a cylinder and a boiler sized to the heating requirements... Yes having an immersion heater is handy, but I've not had one (or needed one) since I left home 20 years ago.

 

[Dan Robinson]

Note to self.....


Must wire the thing up.