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Discuss best combi boiler to replace aging worcester 35cdi without losing flow rates in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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worcester 35 cdi requires replacing
any thoughts on best replacement combi ?
looking for more flow rate at shower too
 
Viessmann 111 what's your incoming water pressure and flow
 
But These are the first people that come on here complaining that they don’t have adequate hot water or they think the installers done something wrong when they probably haven’t
 
But These are the first people that come on here complaining that they don’t have adequate hot water or they think the installers done something wrong when they probably haven’t

Before buying, customers are attracted by combis because of the relatively low cost and extra space freed up by not having a HW tank.

After buying, customers are dismayed that what they also got was an inadequate supply of hot water.

The trouble with 'experience' is you don't get it until after the first time you need it.
 
I don’t know if it’s just me though, I think of myself as a very good communicator with customers and it is amazing the amount of them that are so misinformed when it comes to combis. They all think of a hot water cylinder, be it unvented or vented as being antiquated and think that a Combi is supermodern. I hear all the time people saying but that’s fine no one in our house showers at the same time but they can’t see how circumstances can change in the future or when they come to sell the property all these sorts of things will be flagged up and it will cost them long term
 
... that’s fine no one in our house showers at the same time but they can’t see how circumstances can change in the future or when they come to sell the property all these sorts of things will be flagged up and it will cost them long term

Another selling-point for me is what happens when there is a power-cut for more than a couple of hours. Life is a whole lot nicer if you have a nice cylinder of hot water...
 
But that’s not future proofing Ron if it’s a two bathroom place it should have a suitable hot water set up. You don’t want a boiler to just about cope nor should it be the next house buyers job to spec it properly
 
But that’s not future proofing Ron if it’s a two bathroom place it should have a suitable hot water set up. You don’t want a boiler to just about cope nor should it be the next house buyers job to spec it properly
Up to 3 Bathrooms Riley. No problem with this type of boiler. This type of boiler is a combi ... its Kind of combination storage designed for big family houses.
 
I know what it is but a Cylinder is still better mate. Can do up to 50 lpm whereas 938 can do up to 20. To me that’s just about coping with demand
 
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Yes I saw that but it’s kind of reinforcing the point the combi isn’t really suitable
 
Ron loves the combi’s Riley.:D:D
Yes! Why going back in tiles when you can go forward? Uk love to be 50 years behind other countries? However, you can fit even a stream Heating system if you wanted to, me personalny i am going with the future which in turn safes a lot MORE monety and hassle.

Riley, i understood what you meant. I just think that vaillant producent something which is made for purpose.
 
Yes and I’m all for things like this if it’s suitable for where you’re installing But it’s not fit for this purpose mate. The Op only has 16lpm that’s not enough for two bathrooms and I still argue that 20lpm is not enough to adequately run two bathrooms. I like modern and futuristic ideas, trust me I do but the spec quoted by Vaillant is simply not enough for me to take a punt and hope the customer is happy
 
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I’m not having a go but I don’t understand why the time saved, cheaper option is better
 
I don’t know if it’s just me though, I think of myself as a very good communicator with customers and it is amazing the amount of them that are so misinformed when it comes to combis. They all think of a hot water cylinder, be it unvented or vented as being antiquated and think that a Combi is supermodern. I hear all the time people saying but that’s fine no one in our house showers at the same time but they can’t see how circumstances can change in the future or when they come to sell the property all these sorts of things will be flagged up and it will cost them long term
I wish these things were flagged up when purchasing a property. My daughter has just moved into a 1935 house ... looks Great. She had a top of the range building survey. Nothing done on the plumbing apart from turn on taps. The incoming main is 15 mm. Combi boiler at one end of house. Flow rate at bath (one tap) 11 lpm, with nothing else being used. Two bathrooms. 35 kw boiler. Sure that boiler would provide adequate hot water ... but limitations might be flow rate through long lengths of 15mm plastic pipe.

In America the max permissible shower flow rate is 2.5 US gallons per min .. 9.5 litres a minute ... this mus be a pretty good flow rate. In these environmentally friendly times perhaps we should be looking towards lower flow rates.
 
I don’t know if it’s just me though, I think of myself as a very good communicator with customers and it is amazing the amount of them that are so misinformed when it comes to combis. They all think of a hot water cylinder, be it unvented or vented as being antiquated and think that a Combi is supermodern. I hear all the time people saying but that’s fine no one in our house showers at the same time but they can’t see how circumstances can change in the future or when they come to sell the property all these sorts of things will be flagged up and it will cost them long term
I wish these things were flagged up when purchasing a property. My daughter has just moved into a 1935 house ... looks Great. She had a top of the range building survey. Nothing done on the plumbing apart from turn on taps. The incoming main is 15 mm. Combi boiler at one end of house. Flow rate at bath (one tap) 11 lpm, with nothing else being used. Two bathrooms. 35 kw boiler. Sure that boiler would provide adequate hot water ... but limitations might be flow rate through long lengths of 15mm plastic pipe.

In America the max permissible shower flow rate is 2.5 US gallons per min .. 9.5 litres a minute ... this mus be a pretty good flow rate. In these environmentally friendly times perhaps we should be looking towards lower flow rates.
I know what it is but a Cylinder is still better mate. Can do up to 50 lpm whereas 938 can do up to 20. To me that’s just about coping with demand
In America max permisssible flow rate for showers is 2.5 US gals a minute ... 9.5 litres, now that will be a hot and cold mix, say 6 litres of hot a minute .... enough for 3 showers simultaneously. 50 lpm seems a bit OTT.
 
I didn’t say you had to have 50lpm but the capability is there. Particularly if you’re running two big showerheads. That’s the difference with here and the USA though plumbing is a regulated skill whereas here any monkey with a bit of plastic pipe can call themselves a plumber
 
I wish these things were flagged up when purchasing a property. My daughter has just moved into a 1935 house . looks Great. She had a top of the range building survey. Nothing done on the plumbing apart from turn on taps. The incoming main is 15 mm. Combi boiler at one end of house. Flow rate at bath (one tap) 11 lpm, with nothing else being used. Two bathrooms. 35 kw boiler. Sure that boiler would provide adequate hot water . but limitations might be flow rate through long lengths of 15mm plastic pipe.

In America the max permissible shower flow rate is 2.5 US gallons per min .. 9.5 litres a minute . this mus be a pretty good flow rate. In these environmentally friendly times perhaps we should be looking towards lower flow rates.
And again surveys in this country are carried out by people that might know bits about a lot but the first thing they’ll do if they see an old floor standing boiler, even if it’s working really well is to flag it and say a new one will be required
 

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