Service unvented cylinder as part of annual boiler service
- Thread starter Donkmeister
- Start date
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i measured the incoming temp the other wk (to prove to a cust there combi was producing the right temp rise) n it was 7c
Donkmeister id keep with the unvented
Donkmeister id keep with the unvented
donk... safety checks on the unvented dont cost any extra with us. i shouldnt think thered be any extra cost with anyone else either, unless youb havev different folks for the boiler and the tank.
plus you wont have the extra cost and noise of shower pumps.
plus you wont have the extra cost and noise of shower pumps.
Just checked my kitchen cold tap and the temp settled at 8.9°C, so may be 15°C was a bit optimistic. I believe combi boilers have their DHW flow rated for a temperature rise of 35°C. So a temperature of 40°C at the stated flow would only be achievable if the input temp was 5°C or greater - unless, of course, you turn the flow down.
Why anyone would want to stay in a shower for 45 minutes with the water pouring out at 20 litres per minute is beyond me. That's 900 litres of water gone down the drain. And I thought the idea of a shower was to save water not squander it.
Why anyone would want to stay in a shower for 45 minutes with the water pouring out at 20 litres per minute is beyond me. That's 900 litres of water gone down the drain. And I thought the idea of a shower was to save water not squander it.
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B
BigBurner
What maths have you done? Odd maths. Reliability? Who told you?
Try a W-Bosch 550. 25 litres/min. That is 20 litres/min "mixed".
Want body jets ? Look at a Rinnai multi-point or Ethos 54C
http://www.ethosboilers.co.uk/products_54c.php
Or a Rinnai Twinflow:
http://www.rinnaiuk.com/Updates-18-09-08/A4 Twin Flow.pdf
Cylinders can't compete, unless it is around 600 litres.
The average incoming water cold weather temp in winter is 10C
Additionally, I'd like the option to add alternate heat sources in future. I'd like to be able to have that 300 litre shower with less guilt! Finally, all boilers break down, but at least with a cylinder I'll have an immersion as back-up and can employ the services of a more leisurely repairman rather than a 24 hour emergency plumber!
If you are obsessed with having stored water because a bunch of bathroom changers misguided you, then go for a heat bank. This not a direct comparison to an unvented cylinder. It is much more and gives CH buffer, something that bathroom changers can't understand. It is also about the same price so great value.
http://www.advanceappliances.co.uk/gas_or_oil_thermal_store_systems.html
B
BigBurner
That is a 800 to 900 litre cylinder which is commercial sized. That costs an arm and leg and needs its own outhouse.
A high flow shower (body jets). The only way to do it effectively is via instantly heating water. Then take into account the cost of installation and no contest. The figures are so obvious.
heat island
"Overall system" reliability is what I'm after. If a combi boiler breaks down, you're out of luck. But, if a system boiler breaks down, and your hot tank has an immersion, you have a backup. It's me engineering background, you see. I used to calculate MTBFs of large complex systems (not water-related) so I need to have a "reversionary mode"
As to spending 45 minutes in the shower: I'm talking about 15 minutes in the shower, tops!
That won't be every day, but it's nice to have the option. That "only" requires a 200 litre store. Plus it will be quicker to run baths. Plus I'll have an easier upgrade route to renewables in the future as I'll have the option of solar water heating using the second coil.Of course, any flavour of mains-pressure system is all academic until I get my incomer upgraded: I haven't tested flow or pressure yet but a 15mm incomer seems a bit weak for such a system. Hopefully I'm wrong!
And at the end of all this, the clincher will be one factor: price. When it comes to replacement time, I'll go for the best system I can afford from the most competent installer.
If price is an issue, start looking in another direction.
For a well performing unvented you will need: good boiler, good cylinder, renewed mains all the way to the street connection, and a good installation.
you are looking at over 5 grand.
as for the backup when the boiler fails, surely you would not be one of those people who think a morris minor is better than a lexus because a lexus does not have a hand crank to start it when the battery fails?
For a well performing unvented you will need: good boiler, good cylinder, renewed mains all the way to the street connection, and a good installation.
you are looking at over 5 grand.
as for the backup when the boiler fails, surely you would not be one of those people who think a morris minor is better than a lexus because a lexus does not have a hand crank to start it when the battery fails?
Hi I'm James
I wouldn't waste your time or mine servicing your un-vented
Heating system for £30.00 I wouldn't insult you.
With un-vented systems you must have good mains pressure. and economy 7 or 10 then hopefully plentyfull of hot water.
When I see people slagging off heatings systems, I usually assume they are just looking for work? lol
James G3 unvented Heating Engineer
Manchester.
I wouldn't waste your time or mine servicing your un-vented
Heating system for £30.00 I wouldn't insult you.
With un-vented systems you must have good mains pressure. and economy 7 or 10 then hopefully plentyfull of hot water.
When I see people slagging off heatings systems, I usually assume they are just looking for work? lol
James G3 unvented Heating Engineer
Manchester.
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