Re: Heating design diagram (preliminary)

[IMM]

Those I have come across I would not describe as inaudible. Unless they were duffers. They were early units and Keston have done a lot to the Celsius since introduction.

[Aidan]

"...sopunds getting oit."

Sounds like a line from 'The Jabberwocky'. The lad has a great future in nonsense verse. His nonsense prose won't catch on, though.

Whether it would keep you awake? It depends on how noisy it is (I've no idea) and how lightly you sleep (no idea). There is very little background noise at, say, 4 a.m. when the boiler might fire up. 'Inaudible' sounds are much more intrusive.

I know a gas fitter who put a boiler in his loft, but found it woke him up every morning. That was a few years back, boilers may be quieter now.

[raden]

In message , IMM writes

Costa del Sol in the cheap season then ?

[Andy Hall]

Eyebyeza......?

[John Aston]

Ed, how do you rate the C40? I'm intending to buy this boiler and Keston's Spa 300L cylinder.

I was going to use it to add inhibitor to the heating system.

It's borderline. Gemonix sell a 300 litre expansion vessel part ZI-318300 for £266.64+VAT.

hope that that will be OK for my application.

Thanks, Ed. Maybe I'll lay the pipe for the secondary loop and only add the pump later if the dead legs are a big problem.

[John Aston]

Since posting the drawing, I've decided to do away with the pumps on each individual radiator circuit and replaced them with zone valves. A single variable speed pump on the header's secondary outflow gets the hot water to the various circuits.

I've also changed from Y-plan to S-plan.

[IMM]

I wish it was Maxie. All that cheap sagria!

[IMM]

Grundfos make:

1. a dedicated secondary circulation pump for ~£100.
2. a booster pump for ~£80.

The booster can be used with a pipe stat.

[Dave Plowman (News)]

Are you absolutely certain the maker allows this boiler to be fitted in what would amount to an air sealed cupboard?

[IMM]

If you know anything about boilers, which you don't, they can. Air from outside cools the inside as it enters. Now you know and I'm sure you will forget immediately due to lack of focus.

[Dave Plowman (News)]

I'd suggest you catch up on reading the other threads since you've been away. Without your rubbish to wade through it won't take as long.

I'd take advice from the maker any time before the likes of you. How's the hacksaw?

[Ed Sirett]

We had a number of problems mostly that the gas valve kept getting choked with a fine dust from the old 1" supply pipework (Yes I did blow the pipe through before reusing it), replacement of thge pipe with new 28mm stuff put an end to those problems. After the first year when I removed the burner the top HE tube was distorted which was replaced under warranty.

The design is the same as the Celsius 25 just bigger. It is not as quiet. The same money nearly gets you 2 C25s which space permitting would be the way I would go in future just because a) there is in built redundancy. b) 7-50kW output (cf 11-37kW). c) quieter.

Is this essentially a built in funnel with a valve?

the pump later if the dead legs are a big problem.

Well in relation to the multi thousand price ticket another £150 is not a relatively big deal.

[denbigh1974]

Unfortunately, the C25 doesn't have weather compensation. Nor does it have two switched live inputs (dual flow temperatures for hot water and central heating). The C40 has both these features and I need them both.

To quote from the HVCA's Domestic Heating Design Guide:

"The top-up unit is connected to the highest part of the system and is fitted with a double check valve assembly and automatic air eliminator. The unit, which has a water capacity of about three litres, is topped up manually when the water level drops. It is also useful as an indicator of leaks in the system. It should be connected either to the return side of the radiator distribution pipework or to the return side of the primary domestic hot water circuit.

The commissioning of the system is greatly simplified when a top up unit is installed as initial pressurisation is unnecessary." Cheers, John Aston

[Ed Sirett]

=

I accept these points.

Note that the C40 is set up for using a 70C-50C design out-of-the-box so that you will only get 70 flow when the weather is very cold outside. On mild days you may well find the boiler wants to run at 50C (flow) even when the boler control is turned up fully. This may or may not bother you. It can also be changed.

There is no way I'd choose to fill a large system 3L at a time when the mains filling loop is connected. As far as I can tell it will be useful for adding chemicals when the system is empty or at least at zero pressure, there is no way it will top up the system once it is pressured.