Advice on combi boiler
- Thread starter low drains drifter
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Jeez , obviously you don't work in the industry , converting KW to M3 is simple maths.
53.4 * 0.094 = M3.
53.4 * 0.094 = M3.
Only one I believe would be needed; for the low pressure cold supplies. Do you know what a combination tank/cylinder is? I did see some on a site that were made with the connections made by the makers on delivery.
Funny you should say that - I have one in the workshop being used to hold the copper snots for the Christmas drink. Would you like a picture?
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For the life of me I really don't understand why JH would contemplate being a wanna- be gas man.
Feck knows Steel - but it is amusing 
.
He must have a collection of spades and live in an area of soft loamy soil. he just luuuurves digging holes for himself.
.He must have a collection of spades and live in an area of soft loamy soil. he just luuuurves digging holes for himself.
Chavvy, you are supposed to be a drains man and all that. Combination cylinders can be very large indeed. Those I saw were 6 foot high and most was the cold section. When using a combi for the kitchen tap and shower, the combination cylinder was mainly off and only switched on to fill baths. When it was switched on the hot section heated up zippo using a quick recovery coil. All the combi's heat was directed into the hot water section.
One was a standard combination and had a 22mm pipe and 3/4" ballcock in it fed from a 25mm cold water main. It would fill faster than the water could be drawn off. They were just like unvented cylinders to look at, all cladded and neat. Just the same to pipe up as well. The cold supplies, except the kitchen tap and shower came from the combination cylinder, the only difference in connecting pipes. Worked wonderfully and no annual G3 service, or G3 installer and all low pressure water storage.
The way to go over unvented cylinders. A simple combination cylinder doing the low pressure and combi doing the high pressure shower and kitcen sink.
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NO that must be copper me old Chav.
Is that what a "diverting shower/bath filler moron" is. Fantastic. The two combis can deliver over 20 litre per min, about the same as any unvented cylinder, but for ever, join the two combi hot draws-offs only to fill the bath using check valves, and keep the rest separate. If the bath filler and shower are all one unit then it has to be treated as a bath. SimplesGoogle turndown ratios.
What happens if they have a diverting shower/bath filler moron?
Mine for example. Push button 1 it fills a bath.
Push button two, it runs a shower.
Push buttons 1 and 2, it runs both.
Aren't you glad I am here
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John, on the previous page you were promoting the use of twin combination boilers to negate the need for "No large cylinders, zone valves and the likes", now you're talking about combination cylinders "Combination cylinders can be very large indeed. Those I saw were 6 foot high". Hardly space saving, please make your mind up!
I am giving alternatives. The low pressure combination cylinder and high pressure combi is a great alternative to an unvented cylinder for sure. No explosion risks and G3 is eliminated. The shower goes on for ever never running out of hot water. They do not have to be 6 foot high. What size to do want? Tall thin cylinders take less floor space than short fat cylinders. A quick recovery coil means a smaller hot water section as all the boilers 24 to 30kW is being pumped into the hot section.
The advantages of the two combis is clear to be seen in all aspects. Using two Intergas combis that is only 8 moving parts plus the two more of the two check valves when combining the two draw-offs for a bath, so only 10 moving parts. If no bath then no need to join the draw-offs as each combi can do a shower each. That is amazing. Simple zoned heating with no zone valves. Lots of space saved. Backup DHW & CH in the house. Never run out of DHW. An Intergas Rapid 25 sells for £630 inc VAT and flue. That is £1260 for two. Maybe a discount for ordering two. They give over 20 litre/min of DHW. Then only pipework is needed, some wiring and radiators after the initial purchase. It is a no brainer in a two bathroom house, even a large one.
By the way I never used the diversity factor on the two Intergas combis. When you do, the figures are even better. Using the diversity factor two 32kW Intergas combis with a hob can be used on a U6 meter. That is a DHW delivery of 26 litres/minute. Excellent to say the least.
Price all these up and you will find you get great bang for buck and happy customers - remember them? The customer. Do not just follow the crowd. THINK!
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Chavvy, well you could use iron, steel, brass or any other metal if you like. But not plastic for sure.
You are taking a hammering aren't you? Save all my posts for future reference. Value them. Act on them.
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Chavvy, well you could use iron, steel, brass or any other metal if you like. But not plastic for sure.
Do you know anything of the CHIPS system Dr Drivel??
What's your view of a Heatbank?
You must be knocking on Dr Drivel, sitting there in a Nursing Home pizzing yourself!!
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