System boilers with high modulation radio and independently head/DHW coil flow tempe

[ringi]

So as to get the best condensing when running heating, the flow temperature from the boiler needs to be set as low as possible, by installing radiators that are sized for 50c => 30c (often called oversized.) However the DHW tank must be heated to above 60c, so needs a flow temperature from the boiler of 70c.

Yet most system boiler I have seen only allows one flow temperature to be set, does this not make it impossible to operate a system so it condenses most of the time while running the radiators?

Also combi are about with a modulation range of as such as 10:1 but system boilers seem to have a much lower modulation range, how come?

(I am staring to consider the heating options for a property I brought at auction last week; it will have 5 bedrooms, ideally each on its own zone, as I will be letting it “room by room”. However it has solid walls, so the peak heating demand will be high.)

 

[Ermintrude]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

Cylinder needs it's own VT supply! Easy!

 

[IDCHAPPY]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

A zone for each room?? Christ, you may as well put heat meters in the flows to each room if you are going that far :lol:

 

[lame plumber]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

best get your hmo licence sorted first from your council before you start installing your system

 

[Ermintrude]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

We had issues with HMO! It's the environmental health dept usually..... What a pain in the arris for you poor landlords can't cram 35 students in a 5 bed one bath any more! What??? Some detectors, periodic inspection, locks fire doors.....

 

[lame plumber]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

full fire alarm systems, smoke free escape routes, alarms in each room................... the list grows and some uni towns arent granting hmo licences in some areas to bring the housing balance back to families and a few students.

 

[ringi]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

The HMO licence is a bit of a pain, but it is reasonable what they ask for, it is not hard to meet the standard on fire alarms, fire doors etc. Also it does help reduce the number of competitors:yes:

I am starting with a house that is in a very poor state, therefore most of the work that trip people up, has to be done anyway, for example a fire door costs very little more then a normal decent door, and all the doors need replacing anyway.

Likewise with the heating, the current radiators are very old, most likely full of muck so a complete replacement is on order.

I wish that heat meter were more reasonability priced, if forced I can put a data logger on all the 2 way values to prove how much each room is asking for heat. But I expect my tenants will be “high end” enough that it is not an issue.

I yet to decide if I will zone each room with a timer/thermostat, or just have one timer and TRV in each room – the cost of zoning is not too unreasonable if done when a system is installed. However I can’t zone unless the boiler can cope with a VERY low heat demand.

 

[lame plumber]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

so how are you charging for HW? keep it simple and sweet, programmer on long periods and wh fm 0500 -2300 with trvs on rads and a room stat in landlord area thats tamper proof. divide bill amongs tenants

 

[IDCHAPPY]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

Thank feck I never become a huge landlord, i rent out one property but the minute profit comes before the standard of housing of the people you rent out to. I'm out

 

[ringi]

Re: System boilers with high modulation radio and independently head/DHW coil flow te

I am not going to charge seperatly for HW or heating, however the tenancy agreements will have a fair usage limit, and if the utilities cost more than that, than the tenants get billed. Having some ideal the relative usage between tenants could be useful, just tenants knowing that I can check may get them to turn down the radiator rather than opening a window.