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Hi all
I've been reading about the Drayton Wiser system and along the way I began to go down a rabbit hole learning about heating system optimisation and efficiency and i've come to the conclusion that the boiler in my property is way oversized for the requirements,
The property is a 4 bed, detached new build property (completed Sept 2022) so should have fairly low heat loss. From the EPC report I have the floor space is apparently 115m2, so even at the "worst case" estimated heat loss I saw online of 40w/m2 the requirement is around 4.6kw. There are 14 radiators, a bath tub and two thermostatic showers (but we wouldn't expect to be able to use them all at the same time). The boiler can generate an enormous amount of DHW (15l/min) but surely the mains supply would struggle to keep up with that?
The boiler that has been fitted is a 36kw Baxi Assure combi boiler, which, if I am reading the specs correctly, has a minimum CH output of 6.7kw, so even on the lowest modulation, it is way too powerful for the installation. To add insult to injury, the builder installed an outdoor weather sensor, but didn't bother to connect it to the boiler (which is against building regs as the installation is not Boiler Plus compliant), but at this point I am not too bothered because I am looking to fit smart boiler controls anyway.
Specs taken from Baxi's website:
My questions:
Is the boiler oversized?
If so, is there anything I can do about it?
I intend to fit the drayton wiser system, connected to the boiler over opentherm and fit smart TRVs on all rads (except the towel rads in 2x bathrooms) - I know this probably won't increase the efficiency too much but it should provide at least better control of the system from a comfort perspective
Thanks in advance
I've been reading about the Drayton Wiser system and along the way I began to go down a rabbit hole learning about heating system optimisation and efficiency and i've come to the conclusion that the boiler in my property is way oversized for the requirements,
The property is a 4 bed, detached new build property (completed Sept 2022) so should have fairly low heat loss. From the EPC report I have the floor space is apparently 115m2, so even at the "worst case" estimated heat loss I saw online of 40w/m2 the requirement is around 4.6kw. There are 14 radiators, a bath tub and two thermostatic showers (but we wouldn't expect to be able to use them all at the same time). The boiler can generate an enormous amount of DHW (15l/min) but surely the mains supply would struggle to keep up with that?
The boiler that has been fitted is a 36kw Baxi Assure combi boiler, which, if I am reading the specs correctly, has a minimum CH output of 6.7kw, so even on the lowest modulation, it is way too powerful for the installation. To add insult to injury, the builder installed an outdoor weather sensor, but didn't bother to connect it to the boiler (which is against building regs as the installation is not Boiler Plus compliant), but at this point I am not too bothered because I am looking to fit smart boiler controls anyway.
Specs taken from Baxi's website:
My questions:
Is the boiler oversized?
If so, is there anything I can do about it?
I intend to fit the drayton wiser system, connected to the boiler over opentherm and fit smart TRVs on all rads (except the towel rads in 2x bathrooms) - I know this probably won't increase the efficiency too much but it should provide at least better control of the system from a comfort perspective
Thanks in advance
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