Replace boiler when replacing the rest of the central heating system?

Right - Thanks Bod and sxturbo I'll have it cleaned, serviced and inspected by a Baxi guy - Thanks you've just saved me £1k drinks are on me lads!!
Where's our online digital pub?? I want a pint of digital real ale :LOL::D
 
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Bodd said:
If you stick with a combi I would have one Electric shower, as back up hot water if the boiler one day packs up.

On the other hand I wouldn't put a combi in a 4 bed house with two showers. Is there a bathroom?
Click to expand...

If you have a 25mm incoming cold supply a 40kw intergas will easily serve two showers, and the customer will say the hot water is outstanding, that's what my customer said !!
 
The pipe is going to be a 25inch at least I think as we're replacing it
 
gasbanni said:
If you have a 25mm incoming cold supply a 40kw intergas will easily serve two showers, and the customer will say the hot water is outstanding, that's what my customer said !!
Click to expand...


All my customers think I'm outstanding.


When ever it is relivent I say to customers who want a Combi to have an electric shower. Purley as a back up hot source.

I didn't follow my own advice at first. Now I have an additional shower room I have an electric.

In Jim's situation. I would have a Thermostatic shower in the room closest to the boiler and the electric furthest.

Problem with combination boilers is they waste so much water before they get hot.
 
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Bodd said:
All my customers think I'm outstanding. When ever it is relivent I say to customers who want a Combi to have an electric shower. Purley as a back up hot source.
I didn't follow my own advice at first. Now I have an additional shower room I have an electric. In Jim's situation. I would have a Thermostatic shower in the room closest to the boiler and the electric furthest.
Problem with combination boilers is they waste so much water before they get hot.
Click to expand...
What's the planning situation called when you calculate and check that enough hot water can be produced when all outlets are in use?
 
Last edited by a moderator:
As Gasbanni said you could have a 40KW combi thst could deal with hot water use at the same time. Thsts only if your getting a working pressure that exceeds what the boiler is capable of. I don't know the figures off hand. But there is no point fitting a 40 KW boiler if you only getting 1.5 bar working pressure. If 40KW gives 16 L per/min yet your incoming water mains only produces 12 L per/min, then you may as well fit a 30 Kw boiler.
 
Bodd said:
All my customers think I'm outstanding.


When ever it is relivent I say to customers who want a Combi to have an electric shower. Purley as a back up hot source.

I didn't follow my own advice at first. Now I have an additional shower room I have an electric.

In Jim's situation. I would have a Thermostatic shower in the room closest to the boiler and the electric furthest.

Problem with combination boilers is they waste so much water before they get hot.
Click to expand...

Even with a hot water cylinder you have to run it until the hot water comes through !
 
gasbanni said:
Even with a hot water cylinder you have to run it until the hot water comes through !
Click to expand...

Bodd said:
I like Combination boilers. Bit if you have lots of room I'd have a system boiler and unvented cylinder with Secondary return hot water
Click to expand...

His house is in bits it's now the time to put a decent system in.


But if Jim is to stick with the combi I would make a manifold and run 10mm to all of the hot taps.
 
gasbanni said:
Even with a hot water cylinder you have to run it until the hot water comes through !
Click to expand...

Yes but the hot water is waiting in the cylinder and ready to run, with a combi boiler the heat exchangers have to be heated up before any heat can reach the water that is already running cold until the heat exchangers have been heated.

There are combi boilers that have a little hot water cylinder inside the boiler to "improve" the supply of hot water,
 
bernardgreen said:
Yes but the hot water is waiting in the cylinder and ready to run, with a combi boiler the heat exchangers have to be heated up before any heat can reach the water that is already running cold until the heat exchangers have been heated. There are combi boilers that have a little hot water cylinder inside the boiler to "improve" the supply of hot water,
Click to expand...
Combi boilers do get a lot of fan mail that's for certain.
 
Last edited by a moderator:
teaboyjim said:
Combi boilers do get a lot of fan mail that's for certain
Click to expand...

They do on this forum, on some other forums they are acceptable but only in the type of home for which the combi concept was created.

This gives some insight into how they came into existence LINK


teaboyjim said:
What do you say are one of the top brands to go for
Click to expand...

I have never lived with a combi but have experienced them when staying in other people's houses.
 
Bodd said:
As Gasbanni said you could have a 40KW combi thst could deal with hot water use at the same time. Thsts only if your getting a working pressure that exceeds what the boiler is capable of. I don't know the figures off hand. But there is no point fitting a 40 KW boiler if you only getting 1.5 bar working pressure. If 40KW gives 16 L per/min yet your incoming water mains only produces 12 L per/min, then you may as well fit a 30 Kw boiler.
Click to expand...
This is where the plumbing gets into the physics of plumbing. So does this mean that there's no point having a combi that's more than 30kw because it can't deliver any more than the maximum pressure from the mains?
 
teaboyjim said:
This is where the plumbing gets into the physics of plumbing. So does this mean that there's no point having a combi that's more than 30kw because it can't deliver any more than the maximum pressure from the mains?
Click to expand...

Yes .... but you may have what it takes for a 40kw
 
D

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